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As far as fitment issues. Is the Dart block and my production block (1994 vintage F4TE) stamping have the same external bolt holes. I wasn't sure if I would have fitment problems with dropping in the dart in my SPF and have everthing bolt-up exactly as my stock block. When did Ford start making a roller block. My SPF was pre-owned, I'm not sure if I have a roller block. I believe it was right around 1994 when Ford introduced the roller block.