[olddog]

On the Windsor the 221, 260, 289, & 302 are all the same deck height block, but the 351 has a taller deck to accomodate the longer stroke.

There were two mutations of the 351 Cleveland (called 335 series) engine. They are the 351 M and 400 M (M=modified). They are essentially the same block as the 351 C, but they have a big block bellhousing pattern. I'm not sure if it is the same pattern as FE or 385 series, or if FE and 385 share the same bellhousing. Hopefully someone will answer that question.