NOT according to cosworth, just read it in the book, the 200 block was BASED on the RS500 block, early 2wd sapphys(88) had ex 3 door engines out of cars when they replaced the egines with the RS500 ones.
Ford Germany recalled thousands of cossie's(3 doors) as all were suffering head gasket failure, this was then rectified with a YB O611 head gasket, with a OMEGA fire ring incoporated into it.
It was found due to expansion of the head mostly around the exahust area that the head was moving and so killing the seal.
The 4wd head is different to counteract this, as is the block.
All in the book by Graham Robson, with contributions by cosworth/ford etc etc etc.
There was even 1 3 door 4X4 cossie made in black, as well as lots of other specials.
tabetha