holy old thread, but i found it! i m rockin a 1979 4x4 Pickup as well
20R , 4spd, pretty much stock (i think) i bought it off a old guy who was working on it 4 a while b/c the kid that owned it b4 him beat it...minor rust repairs that r "fixed" need to still be adressed, and the wiring is a 100% nightmare...maybe 2 wires are original...there is are mazda parts under the hood (such a pity)..it was flat black (very poor job..) so i painted it Ultra Flat Olive Drab from a rattle can