Interchangeable engine parts for a straight 6 200

I have a 1968 Ford Falcon inline 6. The shop catalog for the Ford falcon also the Mustang, and the Torino on the cover ,so should all the parts from those cars be interchangeable? What other cars have the same engine that I could use for replacement engine parts?

Thanks

I think that as far as the actual engine parts go any Ford or Merc 200ci 6 will be the same...
In the later models (with smog) there will be differences in the manifolds and possibly in the head.
The internals should be the same.