I may have a chance to pull the oil pan on a 91 or 92 350. I know it's a one piece rear main seal, might even be a roller motor. Any benefit going with that instead of the 2 piece rear main seal? I can get this assembly http://store.summitracing.com/partde...5&autoview=sku which comes balanced unlike the Northern Autoparts kit so if I can clearance the block myself, I should be able to build the shortblock without a machine shop, although I might because they'd have to bore it. I may have to scale my horsepower & torque wants down a bit as I may have to use that th350 in the truck as it is now and not upgrade to a th400 or a really built 700r4. It may have to get built faster than I wanted.