Gary,
I don't really know why Ford cast the fmx block in 1973 only. I can only guess they had an excess of Windsor/Cleveland fmx trannys and decided to utilize them rather than dump them.
The engine went into mid size & full size Ford products such as LTDs, Thunderbirds, Torinos, and Mercury products such as Marquis, Montereys & Montegos. Knoweledgable Ford folks keep an eye out for them, it's been 30 years, they are fairly well weeded out, but they do turn up now and then. So I would say it is difficult to find one, but not impossible.
The only issue is the ease of swapping a 400 in place of a Windsor/Cleveland, with this block, there is no need to swap trannies or adapt a bell housing.
I agree Michael, that big cavity in the back of the block is "funky".
Your funky friend on the PIBB, George
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