It can be done, but it's more expensive that other swaps. The easiest would be a 302 or the '85 5.0 Ford HO. The 351 doesn't fit easily and there's several different 351 Fords (351W & 351C, for example) and they're each TOTALLY different from the other. Make sure you're working with the 351W because the 351C just doesn't work..
