amen on the timing chain if you are willing to change heads you will want to go for a set of dove or the c8ve heads 18 cc dish pistons, if not use flattop pistons and with either one zero deck the block run a .040" compressed gasket, exhaut porting will reveal tremendous gains on any ford head if you are a can do type of person you will still need a guide cause hogging out is not the proper way subscribe to this site $25 and well worth it http://www.reincarnation-automotive.com/ . i believe a xr292r cam will do you great this is a solid roller cam with a pretty choppy idle, 750-950 cfm carb. punch out the holes .030 to make a 466cid and get ahold of paul kane he frequents this site he can give you the lowdown on the oiling mods to make, seeing as this is a street car i would use a weiend stealth intake. this is a recipe for about 600 hp if the heads are done right.