Want to find out if this engine is worth any effort: I have a parts truck ('72 K5) that has a recently (3-4 years ago) rebuilt engine and has been sitting for a while. When I bought it the PO had it out in a field. Supposedly only has 500-1000 miles on it and it looks pretty decent (no leaks/oil in compartment). It was sitting with no hood or air cleaner over the carb and a tarp loosely over it. I pulled the carb and there is a little surface rust down in the intake manifold, pulled the valve covers and everything looks nice there, pulled the plugs (looked OK) and turned it over by hand, seemed to turn over OK but with some resistance (but this is the first time I've tried this so I have no idea what it should feel like). What else should I check and what should I be looking for? I got the suffix code off the front of the block (CMJ a '75 145 HP) and the head codes ('74-'80 76 CC is all it said), doesn't look like anything special, the engine in my other '72 is just leaking like a sieve and probably has the full 105K miles on it.