As I said before
Mod prod blocks have to have been available in the host vehicle at some point. Or a manufacturers specified option. i.e an "exchange unit" etc. "205 blocks" for example are ok for an Escort as they were what you would get if you went into Ford for a re-con or exchange engine in mid-late 80's
As were "AX crossflow" blocks etc. They were the "Manufacturers specified option"
205 blocks were just a later version of the 20 block. NOT specifically a "Cosworth" block although they were used in the first 3dr Cosworths.
You could have had a 205 block in a late Capri or a Transit van.
And as an exchange short engine if you blew up your pinto powered vehicle.
Hope this helps
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