I have a 63 215 all aluminum engine. I have the 64 300 heads that everyone seems to want. I have been told that that putting the 300 heads is the hot ticket. I am not sure how to graft the two together because that one head bolt does not line up amongst a few other things. I have a bellhousing that mates to a T5. It would be a great setup to put into my S10 mini truck. Mini truckin!