Offset will not suit the RWD application, and at least foul the front struts. Spaces and long wheel studs are an (illegal) option, but....
FWD offset brings the wheel too far into the car, with RWD offset having more dish... Even Cortina )TC-TF) wheels will not fit on and Escort front - hitting on the front struts... Cortina Ghia and Escort Ghia only have an offset difference of 15.7mm, but that is enough...