cleveland??

[68LSS1]

I forgot to add that the casting numbers are always the best way to go when identifying Ford blocks and heads as the machining that is done after casting determined what it ended up being. As for the 351M/400, they are two different engines. Pretty close except that the crankshaft throws are different between the two (half the stroke). So you have a 351W (made in Windsor, Canada), 351C (built in Cleveland), 351M (informally called M for modified or Michigan and made after the end of 351C's in '73) and the 400 (made from '71-'80). Block casting numbers should be under the right rear cylinder head. Give me the number and I'll see what I can find, just will need to make some other visual identifiers to ensure it is what it says (seen a few 460 blocks actually be 429's).
Prodigy, problems making hp with a Cleveland? A Cleveland powered '72 Mach was my first car and became a pretty good strip effort for a high school kid (in the days of almost 20yrs ago). Ran a best of 12.12 with no stall, never could keep a tranny behind it. This car is hopefully to soon become my first PT effort. I think pound for pound the 351C is one of the best engines to come out of Detroit.