How much to stock rebuild a 360?

First, decide WHAT you want from your engine. Economy, many years of service, power to tow or a fire-belching tire burner. Then, find and talk to a good machinist about your plan.
Mopar Muscle Magazine, (and others) have done several low-budget builds with building tips, parts and labor prices listed, (check their archives). Keeping it close to factory specs. will make for more dependability. The best money spent for power is in the heads and cam. High compression, (above 9:1) is not usually best (for many reasons) for a street engine. A street engine rarely exceeds 5,000 rpm. so building a 7,500 rpm. screamer is likely to disappoint. Most of the time, mid-range torque is usually more satisfying than high-rpm. horse-power.
So plan your engine build with realistic use in mind. Monster cams & valves, high compression and over-carburation may end up disappointing you. But a well thought out build is the only way to go.