i`m at work so i can`t look,heck where do i look and then how do i I.D. them..(look them up)sorry about this i`m out of practice my firist car was a 70 road runner,untill i had kid`s,so i`ve been driving suv`s and van`s for awhile,hey kids are grown i bought a 2002 z28 and this nice truck for my son(17) believe me i need all the help i can get.if the main is blown can the heads be salavaged............is it the main or maybe the tranny some how.that other 350 with 300hp was going to be built by periscion auto in houton there the best in town,i would get block thru valves,use my valve covers and intake ,carberator,oil pan. etc