XR 200's were short deck engines, just like the US ones, except for the bell housing spacing. The rest is the same. Addo is right. The 1968-1970 188/221 and 1970 on 200's after the XR were taller than the US Mustang engines, with all the items listed being different. The good thing is they look the same.
The thrust bearing and details are the same for the XR 200's and 188/221's . It was the US 250 and Aussie tall 200/250's which got the changes in bearing size.
It's a little complicated, but you'll get there!
A set of triples SU's on an XR 200 with 2V head would be wild!