hey everyone thank you all for the info,and sorry it took so long to get back ,family stuff ,so go with a 327 ,or if i'm running a 4 speed muncie transmission or something like that i can have some fun with a 302,this is for a 67 camaro ,can't remember but i think the rear end is 4'tens or 4'15 i counted on the tier 4 /14 i think,......thanks to eveyone well appreciated