[skoffice]

I'm doing the exact same setup right now in my 71 but my 5.3 has 50k. I just put an adjustable timing set and new oil pan gasket on and I'm going to see how she runs as is. If I were tearing it down as far as you are planning though, you might as well take it in. For probably an extra $500 you can pretty much have a guaranteed new engine at that point. Have the block decked and torque-plate honed, and a quick stone grind valve job and surface the heads. With it being completely apart, its the best opportunity to get a perfect fresh runner. Do it once, do it right I always say.