350 Vortec

I'm looking for a 350 vortec out of any Chevy Z71 pick-up or any Tahoe. I'm in need because my 1998 Tahoe is acting up and the engine is sitting on 223,000 miles and I'm in need of a new one because the rest of the car is running perfect but I don't want to let the engine blowing while driving it down the road

as long as it still sounds decent, and the oil and fluids are in good shape and its not clattering, rattling, keep running it down the road.