If you have going from a manual tranny 248 to a manual tranny 263, no problem. Same for DynaFlow to DynaFlow. The end of the crankshaft on a engine w/ a manual tranny is different from that of a DynaFlow setup engine.
Also, the engine mounts on a later 263 are on the side, while the engine mounts on a 248 are on the front of the engine.
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