I agree that I'd look for another block before rebuilding a 53 block.
Difference between a 12v block and 24v is 12v as pipe threads for the oil sending unit were 24v has ORB threads, also 24v blocks have 6 bolt holes for the engine mounts and 12v only has 4, pretty sure 24v uses the back 4 holes on the left side and 12v block doesn't have the back holes.
12v blocks didn't really have a dowel pin issue as 24v blocks have the same dowel pins, the issue was the block plate was straight bored for the pin to fit in which also allowed the pin the work it's way back out, Cummins later revised the block plate with a tapered hole to prevent the dowel from coming out, all 24v block plates had the tapered hole.
As for the Dmax and later Ford remarks all I can say is at least you don't have to lift the cab off to work on a 12v or 24v Cummins.
I've seen one Ford with a JD conversion and one with a Perkins but choose the 12v Cummins route myself.
These are photo's of my F-450 with the 12v Cummins I swapped in
This conversion is how I got my user name Destroked 450
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