Take it from someone who has done one of these swaps, get the supercharger. You can spend alot of time with freinds and family having fun or you can be the guy that everyone knows at the parts store. I put a turbo on my 80 and it performs well enough that I don't have those terrible V8 thoughts anymore. I have come to this conclusion from building and owning my 76 FJ40 which has a Chevy 350 TBI with a cam made for the TBI fuel system, larger injectors, aluminum radiator,4" lift, 35" M\T's, Air lockers, 700R4 auto with overdrive, Short Jeep style 300 Dana t-case, Dana 60 rear axle with FJ40 outer hubs and disc brakes, Renegade grill guard and rear tire\cooler carrier, full roll cage, aux fuel tank, shackle reversal, power steering, air conditioning plus lots more that all works. I built a M715 for my wife that is the same. Right after I finished these projects my wife somehow got pregnant. Then she got pregnant twice more. 2 sets of twin boys and a single one in the middle. All 5 years old and under. I started the 40 last week but have not driven it in a year. Why would I with an 80 around? Don't tempt fate brother.....