If you want to keep a converter there are different generations. I installed one from a Corvette on my Avanti, less back pressure. No air tube and it bolted up to the two front manifold pipes. Two exhaust pipes come out of it.
Good luck,
Jim Wood
No problem not running it. Just make sure the exhaust check valve is good or remove the air pipes from the exhaust manifolds had insert pipe plugs.
Good luck,
Jim Wood
Could be either, but #1 would fill the cylinders with fuel and could cause hydro lock if you crank the engine. I would pull some spark plugs and check for fuel.
Good luck,
Jim Wood
No hog troughs on a 1989. If its a Monte Carlo chassis you can use S10 drop spindles to lower the front end. I had an article in the Avanti Magazine on how to do that about 15 years ago.
Good luck,
Jim Wood