I bought a COMPLETE LM7 5.3L with 47K miles out of a totalled Z71 pickup for $1000 last August.
Complete "dropout" with all front accessories (alt, A/C, PS, belts, pulleys, brackets, fan), exhaust manifolds, starter, full uncut harness, DBW throttle body, and matching ECM.
Bought from Ebay...a fresh pair of -241 heads w/sodium/hollow valves, pushrods, and a healthy custom ground Comp hyd roller cam. Heads are already setup with correct springs for this .600" lift cam. Paid $600
Purchased from Summit...Edelbrock RPM carb LS intake and MSD 6010 programmable stand alone ignition box. With such a wild cam, I'm figuring it's not going to be too fuel injector friendly...hense the carb setup. Cost $630 plus the Demon 650 carb on hand.
Bought the GM muscle car oil pan kit, new lifters, a conversion flexplate (for TH400) and gasket kit from GMPartsDirect. Cost approx $220
Fuel will be supplied by a Holley 140 electric pump already on hand.
All this should have already been installed in my Chevelle but the project is delayed due to injury.
All extra, unused parts...-799 heads, complete truck intake, DBW assembly, harness, ECM, exhaust manifolds, etc will be sold to offset the initial cost of the engine.