Mark is right. There were a zillion big old Pontiacs made with the 455's, you should be able to turn one of these from some boneyard or used car lot. Don't worry about that nickel thing, you aren't building a high reving fuel motor. These big blocks are tough to kill in any form.

Just start calling junkyards in your area and surrounding areas. Every town has that one junkyard that caters to older cars where you can pull the parts off yourself, or at least walk the lot. That is where you will find one of these.

I saw a '73 Olds 98 sitting behind a chain link fence at a concrete plant. Stopped in the office and found out a guy who worked there owned it. He called me, bought it for $ 100.00, 455 and all. He was in some trouble with the law, and met me in an autozone parking lot on his motorcycle. Had his backpack on the back and was headed for parts unknown immediately after we swapped money for the title.

Keep looking and asking people, someone has one they want to part with.

Don