Alright i race up at bandimere in colorado my 1986 gmc ran a 15.1 how much of a change will be mad with a aftermarket distributar soften the rear suspension and put 3:73 it had 2:73 before and made a way to get air to flow better to the airfilter i also may have a 750 holly i think a 650 edlebroke is on it now if the 750 was put on what would happen ?
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