Well, after almost 3 years faffing around I finally have the suspension sorted - if anyone is interested, for my 1974 KE20 coupe (Jap spec), MR2 Mk1 strut inserts worked with a turned brass spacer the same size as a 22mm copper compression fitting nut in the front and Mk2 Escort rear shocks on the rear. Kept everything else standard with 1.5 inch lowering blocks.
Currently running some period 13 inch 6J alloys with correct 110 bolt pattern and not to fat tyres with no issues with tyres protruding beyond or rubbing on arches.
Now looking to change front hubs and rear drums and drive shafts to get a better choice of Jap period wheels, hoping my KE30 shortened drive shafts in my KE20 axle with KE30 drums and back plates will work. Also hoping that the KP60/61 front hubs that I have will fit my standard KE20 front struts.
Also have a mildly tuned small port 4AGE being built for me here in the UK which should deliver about 180BHP which is more than enough for my needs as it will be used just as a road car which should fit nicely in front of my T50 5-speed gearbox when I can find the parts to re-condition it!
Photos to follow.