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Originally posted by Richard Hudgins ...I personally do not know what the differences may be between a standard 351 and the sportsman block. It appears that deck heights can be different....I can tell you that no one has had any problems fitting a standard 351 into the JBL chassis. Everytime a sportsman block is tried, there are header fitment problems and mount problems. (and it seems to be a deck height and mount location thing.)...
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Ford's catalog lists the Sportsman block as 9.5" deck Height. I know of no engine mount changes. There are also several other FRPP blocks that have a 9.2" deck height. But they are not the Sportsman blocks.
Is it possible that different heads were used on the blocks that had fitment problems? There are a lot of different heads available that use different exhaust ports, Yates, Brodix 200's, TFS Street Heats to name a few.