Is it the original engine? If it has a Pontiac engine in it, then its not original. There were no 400 Pontiacs installed with automatics 79. They were all 4 speeds. If its the 403 Olds engine(that was only paired with automatics), then everything that has been said on here doesnt apply. If its a transplanted engine, then the sky is the limit, isnt it?
Still an easy upgrade to the exsisting engine, would be cam, intake, headers, recurve the distributor, and 3.08-3.55 gears. You can run a TH400 "High stall" converter, its functionaly the same as an L88 converter, stalls a bit higher but doesnt burn up gas, create heat, or slip as much as other stalls do. Plus the high stall is cheap (usually). You can do that with either the 403 or the 400, can you post a pic of the engine? That way we know what it is.
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