score?

bought a 99 blazer for $400 today, guy just put a set rebuilt heads on it and wants to sell it because it is making a ticking sound in the top end, my determination is it just needs a valve adjustment, score?

$3,000 worth of parts/scrap or 2 hours of work and resell it for $1,800


craigslist ad:
1999 Chevy blazer runs and drives I think a rod may be going out. It does make a slight ticking noise but I can still drive it. It's white, power everything, ac works. Has heated side mirrors but one is broken. 500.00