i recently bought a 89 gt with rebuilt 306. it has p heads and e cam and and most everthing else ecept stock intake. my problem is it cant get out of its own way. i had a reputable mechanic look at it and he said the compression ratio cant be anymore than 8to1 with the pistons that are in it. he also said the p heads are 64cc which makes it worse. he told he would to extensive work to them to get the compression ratio back up but i think i should just rebuild the bottom end again with the correct pistons. suggestions?