LONG lost of compatible parts. from a lot of isuzu vehicles. most useful would be the early model trooper which is almost completely compatible with the luv. up to 86 and the EARLY model 87 not the later.
i would say the 79 would be better the engine had a decent amount of improvements including the cross flow head. IF its a simple problem to fix since you would be tearing into the engine anyway.
but im sure there are some who will argue both sides. depends whats wrong with the engine in the 79?
the 72 with the quad headlight setup looks sweet
weber carb = probably best bolt on you can find for the LUV as the stock carb wasn't anything to brag about.

Stock carb.
i would also look into a set of pacesetter headers to go with that weber. makes a big difference.
electronic ignition =
the performance pistons will be a stumbling block for you as there really weren't any made for the LUV. but the stock pistons are suprisingly sturdy and can stand up to turbo boost.
you can get the cam reground for more power.
or hell you could say screw the 1.8L find a donor trooper in u-pull-it and pull out the fuel injected 2.6 and 5 speed and drop it in with a little modification to the driveline it will drop right in for way more power for even less $$$ than it would take you to rebuild the 1.8 and call yourself set with either truck

_________________
Luvless
1980 Mikado-Sold.
1993 Lexus SC400 my Daily
2004 Yamaha WR250F my new love in life
2016 Toyota Camry my girls ride