i was comparing the 89 7m ecu vs the 1g and theres actually very little that is actually different, theres only a couple of wires different and of course there being 3 inj signal wires vs two on the 1g
the 1g's are the same as any a70
get same year mounts and engine harness... and plug her up and i think you're good to go
you may need to do some wiring at the ignitor coil side of things as thats slightly different to 7m but it shouldn't be too hard