Ran great when it was parked. I don't know the actual mileage. The Transfer case failed on the Yukon , so it's been parked for a couple years. Should fit 96 and up Chevy and GMC. It is a roller cam Vortec engine , so you can run a carburetor with a standard HEI distributor if you'd like. I'll include an intake manifold and HEI distributor and carburetor instead of the fuel injection if you'd like that instead.