I'm on Day 3 of driving my Vortec-block TBI K1500 engine.
Short-block had unknown number of miles. Pulled due to a "rod knock" that turned out to be a cracked flywheel. The guy sold the heads, stored the short block for a year before I got it.
Cylinders had .0015 wear. One cylinder had a rust-line where the rings were parked; must have gotten water in it while it was stored.
I bored that one cylinder, honed all the rest. Cam bearings looked like crap, rod bearings were just "OK", but the main bearings and all crank journals were beautiful. I re-used the main bearings, and seven of eight pistons. I re-used the oil pump after cleaning. I re-used the cam and the timing set. When I degreed the cam, it came in perfectly on-spec.
'Course, being that this is a TBI application and I was using a Vortec short-block, I had to drill and tap two holes for the timing cover, and drill a coolant passage from water pump to right-bank water jacket. The previous TBI engine, and the Vortec short-block were both "880" castings, just machined differently.