Yep, what Pat said....it has to be a 427 or maybe 366. The price is OK, but not a steal...I just bought a tall deck 427, complete, but apart, for 300.00. If you just want a Big Block, you would really be better off looking for a 454 core to start with....look in any pickups or suburbans, 70's or 80's pretty much. The 427 tall decks are OK, but a strange kinda fellow, they need different intakes, distributor, oil filter sometimes doesnt fit right, headers can be a fit to fit! Lots of different problems. John