76 to about 85 should be physically the same, so a 76 or newer LUV could take the electronic distributor and such from an 82-85 Isuzu pickup or trooper. I'm not sure on the Isuzu Impulse stuff, never had one to pick over, but the 1.9-2.0L motors used in them are the same block/head design so the dist should be about the same.
75 and older LUVs I don't know about. The dist isn't all that different on the outside as I recall, but it might be. Next time I run across one I'll have to take a look. Only stuff from that era I have left is a block with a rod through the side, but it might be enough to fit check a newer style dist in. Making the bargain electronic conversion available anyone with an old dual point style would be very cool. The place linked about does carry a
model for 72-75 LUVs though, so it is possible to do with new parts.