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Message: <blockquote data-quote="Pure84GTT" data-source="post: 834051" data-attributes="member: 13927"><p>an older 302 block is going to set up for a flat tappet cam, so you will have to get a retrofit cam and lifters, and drill and tap the valley for the spider tray. the steam ports are also in a different location, and the water jacket doesn't protrude into the head bolt boss. all blocks forged in that time period have a higher nickel content, however I dont think it is quite enough to justify swapping blocks if yours is use-able . I have friends that have split mexican blocks and friends that have had late model roller blocks hold together with the same power. if you wanna spend some money on insurance a probe main girdle and a valley brace might be an option to explore.</p></blockquote><p></p>