Re-using low-miles camshaft and lifters?

Absolutely nothing wrong with a used cam even with 150K on it as long as it is in good condition. My only recommendation would be unless you are 100% DAMN sure where the lifters go, and I mean 100 and fifty bajillion percent, get new lifters. In fact, Unless "I" myself pulled and marked them, I would get new lifters anyway. They are cheap enough that you should not take a chance. It should be broken in like a new cam and lifters when you do.