I believe your name is Steve, according to your signiture?
If the block is a Gen 5 or Gen 6 BowTie it is very strong. I wouldn't be scared to put 2,000 hp in either one. It is the standard 502 cu in block that is weak in the main webbing but it will bore bigger. GM recommends to to go 700 hp . I consider this to have a safety factor included though. I do know of them doing more hp.
Ed