I know what you mean. The good thing is that most of my parts have a lifetime warantee so WHEN they go bad I just have to figure out what it is and get a rebuilt one shipped.
My car is like your car I've got a 82 Turbo motor in a 81 non turbo body, with a Z31 fan/fan clutch, hooked up to a 83 non turbo tranny with a 83 digital dash and a soon to be installed late 80's Z31T ECU.