i just bought a pair of F3ZE AA heads that were on a 351 w, from what i understand these are 93 cobra heads. My question is do i have to upgrade my intake,valve covers,headers?? i know i have to change bolts as these are 1/2 in and 5.o are 7/16 i believe. also i was going to look into porting,Also i want to do a cam but dont know what to get as i never had gt40 heads before. i got these heads at a good price and just curious as to what upgrades, porting ect... would be good for these heads. its all going on a 91 lx 5sp. Any input would be great thanks