The only thing a hayes manual is good for is toilet paper when you run out. Even then it,s not so good. Get a factory service manual and save your self some trouble down tho road.
chances are probably not. But theirs always a good port and polish job on the heads that could free up some HP. You could also try gasket matching the heads and the intake manafold for some more HP.
Do not replace that T fitting with a standard T fitting. It has to have the restriction on the leg facing the passengers side or you wont have heat or very little.
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