I got the bottom end of an 86 block an .020 overbore, flat tops and bearings, resized rods and a polished crank. I run that with a delta 268 cam and ground OEM lifters and had some head work done- oversized valves and some mild portwork, chevy springs and hardware. It was decked on block and head minimally for flatness only- high compression needs high te$t ga$$$$. these are tractors and should be built to run on the lowest octane ratings; AKA "ditchwater"- I feed that with a stock intake under an un-hotrodded rebuilt OEM fj60 carb, and OEM dizzy without vacuum advance (advance pots leaked, so I plugged the sources- FWIW, this truck ain't slow...) the fire gets blown thru a pair of stockish 3FE exhaust manifolds, dual drops and then join right before the POS turbo muff. This thing spins an 84 4 speed and splitcase which in turn drives the narrowed fzj80 full floating disk brake rear elocking axle, and the wheel spacered OEM fj55 front. I still have alot of work to do, but the thing is not slow. before I parked it for smog reasons a year and a half ago, it would do a gross of 9000+ feet elevation, 8 miles rough pitched steep dirt muddy road, 40 miles highway, 40 miles insane freeway, and 10 miles city, each day, 5 days a week, for over a year and a half. I passed people on the freeway all the time. I had to try NOT to cruise at 85. A five speed is on the bucketlist for it...I'm currently working on a plan to make it pass smog, but that's more the intake exhaust than anything else. beyond the fluffy cool starry, the motor is a monster. runs on 87 octane and gets 12+ MPG with 4600# fj55 and a lead foot. my best advice is to read "how NOT to build a 2F" by JimC, and find a real machinist. don't buy hype.