I have a 1965 GTO 389 Tripower and there are a few upgrades that I am very happy with:
- ram air exhaust manifolds into 2.5” exhaust system with mandrel bent down pipes, X pipe and Pypes mufflers
- replaced 3/8 pressed in rocker studs with 7/16 screw in studs and added roller rockers & push rod guides
- phenolic carburetor spacers
In terms of fun/driveability, I installed a Tremec TKX 5-speed - a real game changer!
Disc brakes in the front and a dual reservoir master is a great safety upgrade.
In my opinion, these upgrades really enhance the overall driving experience and reliability.
Good luck
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