That is EXACTLY what I did on my ‘83 Avanti when I had had enough of the ‘computer command control’ system!
I ordered a non computer controlled Q-Jet for a ‘78 Impala 350… and also a non computer controlled distributor for same.(distributor has vacuum dash pot)
I made this conversion on my Avanti over 15 years ago… and have never looked back!
And yes, a true dual exhaust system, ‘68 Avanti ll style, also went on!!