Power limits of stock 360 block and crank.

Honestly, given your head choices... Unless you plan to go with high quality full race porting and a race-type solid roller, and build it as a full race engine, and you can stay out of any detonation issues - you're not going to reach near the breaking point of the block with a good set of caps. You don't make 1.6 or 1.7hp per inch out of a stock stroke with a "Stage II"-type head and a roller cam with .550 lift.