ok i dont htink im going to go for the P90 head unless i run into some extra money anytime soon.. i have a complete zx motor F54 block and P79 head and i have a complete 240 motor with a e88 head.. later model 73.. im going to keep my su's and do some head work and get the block slightly bored, cam headers etc.. should i use the p79 on the f54 or the e88.. or should i keep the 240 blocka dn p79? im not sure what to do.. will the e88 work better on the f54? i will probably shave the p79 and add cam tower shims and stuff.. would i have to do that to the e88 too? thanks alot