Geoff

Yep, seat belt light. My '85 has that light in place. Well had, anyway. I'm tearing down for a resto custo mod. But 4174 was a basket case anyhow.

That CHMSL looks like the ones used on the roll hoop of C4 Corvettes (1986-1991, plus all ZR-1). There are 'vette owners whom have swapped those halogen bulbs for cheaper and modern LED solutions. Search the Internet for C4 ZR-1 CHMSL LED and that should get all the necessary information to make the conversion.

Guessing, 3) Eighty

I did put Silvertone loud mufflers on 63R-1025 August of 2021. It was loud! There were some type of glasspacks on it before those went on, but they had one baffle within (couldn't see through those mufflers). The former mufflers were loud but not as loud as the Silvertone ones. Also, 1025 was an R3 prototype so I wouldn't know exactly how an R1 would sound but that combination was a raucous.

Check out SpinTech mufflers. Similar to Flowmaster's lineup they have different series (and shapes) ranging from mild to race. The flow through their design is great. I had a model 3222 on a Mk1 Rabbit GTI and it was a hearty sound, all things considered. I am thinking of building my Avanti like so: Custom long tube headers into a 3" collector, then down to 2.5" pipes with Silvertone's loud option between the outer rail and X-brace. Then cable/rod or electronically opened cutouts, with Spin Tech mufflers mounted somewhere aft of the frame kick-up. That'll be four mufflers in sedate mode and only a pair of Silvertone loud for obnoxious mode. I mean I'm going to be an LS-based Blake, but that should still cause quite a stir. Plus, with Lee Z. doing his things, I might be able to substantially derestrict this build.

From my home of San Jose. Still have my 408 mobile number. At least the metal parts beneath should be good, maybe light surface rust but that would be the extent of it.

At best I can apply general knowledge. Differences in traction bars, radius rods, an added Panhard bar / Watts link? Do their pinion angles vary? Does one model have a pinion snubber and the other doesn't? "Since the snubber tries to lift the car at this point, the rear differential is actually forced downward and improves rear traction." - https://www.hotrod.com/how-to/mopar-rear-leaf-springs-suspension-get-hooked-up/ Sounds like a piece I'd love to fabramacate on my future 1025 modded-dupe … along with some Super Stock Dart leaf packs.

I'll yield to someone who knows these cars, as I haven't dug into the 'Lark lineage' much.

Acceleration contest. Which test are we running? [0-60, 1/4 mile, 1 mile, V-max] I don't know the inner and under workings of these specific cars. My guesses are: Weight bias. Suspension geometry. Aerodynamics.

"not quite there" leads me to believe it's further to go, rather than an overshoot. 4) 63R 1004

Personal experience has me conflicted; the 25th frame, 21st engine and 19th body came together to make 1025. So there's no rhyme or reason to use. I'll throw my dart in the pitch black at a dark wall and hope I hit with, 3) 63R 1003

No offense here, I love the composite bumper Avantis. A 'fat lip' isn't totally unique to some Avanti years, either. They have excellent company in E46 M3, but only the rare V8 equipped GTR package.

4174 says, Hey, I resemble that remark! I have also heard them called 'fat lip' and 'picnic bench.' Though I do like Blake's twins I had an idea which truncates the bookshelf. It looks plausible the front bumper may be pulled in tighter. Plausible might convert to "Yep, it's possible" as I progress with my build. The filler panel could be "86'd" and the remaining outer piece, through some cosmetic work and shortening of the bumper brackets, would get much closer to the car's fascia. On the other hand I may leave it factory and reinforce this area as a place to sit. Some people bring lawn chairs to car shows. I sit on my car. Regardless of my decision I will have (a / some) 1/4"-20 threaded rod(s) protruding so I can mount action cams when I autocross or do track days.