Since you’re looking at Jeep engines, read up on the hybrid 4.0 258 stroker combination, 4.7 liter. Then again, come to think of it, there where a lot of Ford small block pattern 5 speeds. A 2 wheel drive f series truck with a 300 (obviously), 302, or 351 5 speed bolts right up to a 300 ford six, which would make your best low rpm grunt tractor engine. Look for one of the German built ZF boxes, some of the heavy duty six gear ones had an oil pump and cooler arrangement.
