It might be a long shot, but considering putting in a newer V8 like an ls1 in there. I would still make a bunch of power, but since its newer and has better smog equipment than anything from the 70s, you can get away with it. Also, you'd use a lot less gas.
Just throwing it out there.
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Apperance Mods: Firebird wheels of mysterious origin

, Floormats

, and a quarter sized dent behind the passenger door from a TV I dropped!