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I have wondered about that. The block Ford uses in the crate motors is rated for 450hp. Many of these engines are close...maybe over with some mild modifications. In there ASA crate motor (similar to the 302/450hp) the changed the to the R302 block and a zero balance crank.
The Dart and World blocks shouldn't have a problem. BTW, the 625hp engine is race only (including fuel). However they have a wide selection of others including a 375cid 8.2" block and a 460cid 9.2" block.
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