Just recently got the title for the '87 C10 that I bought as a 6.2 donor. Turns out the truck's got a little over 200Kmi on it, and it's the original motor. It's got a newer waterpump on it, and the harmonic balancer was replaced about a year ago. I was really hoping to have the swap done and my K5 up-and-running in time to go 'wheeling this summer, but now I'm wondering if I should rebuild the 6.2 first, while it's out. I do have plans for a turbo, but that'll probably be down the road a bit. Not the small twins I was thinking about before, just a single; there's more fab work for twins than I have the skills/equipment/$$$ for right now. Sooo... Knowing about the high mileage, plus the fact that this truck was used as a plow truck for at least a couple years, should I just plan on a rebuild and start gathering parts, and start disassembling the motor once I get it out of the C10?