This information will become available as time for research allows.
Basically, the mk3&4 Escort came with three different types of engine fitted, two petrol and one diesel.
The two petrol engines fitted are:
OHV (in 1.1 and 1.3 ltr sizes)
CVH (in 1.3, 1.4 & 1.6 ltr sizes with both carb, mechanical and electronic fuel injection and turbocharged)
Details on compatability of parts between the various sizes of engines will be made available as I find them.