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I would put a AL6 MSD on it. Tweak the crap out of the distributor and the carburetor and maybe go to a lighter weight oil. Go dual exhaust or headers.
A good valve job will help also.
I have a GM style HEI ignition I need to install, a new distributor, and dual exhaust. The valves seem pretty good, the heads in general are doin what they should for what they are...garbage lol.
