[Woodz428]

Dimensionally a 427 "mystery" engine is about the dinesions of a 460 Ford, same exact bore spacing and app. overall length. Now....you said a tall block, which was truck engine, I can't recall the deck height without going through some books, but it is most likely an inch or more. The added height could make it too wide or tall to fit easily. The tall block was popular with drag racers that wanted a long stroke and reasonable L/R ratio. While they have better heads,on paper, I think the competition of the era illustrates that a good builder was what made one better/faster than the other. With advanced technology, they are probably both pretty equal in the application you may use it in.Oh and one other thing...they were never an option in a Cobra,LOL.