Depends on your idea of "light".
Motor is a tall deck with 4.250/4.250. Block is brand new GM tall deck, new eagle rotating assembly (professionally worked over prior to installation - A MUST!), Brodix Big Brodie supercat heads with our head guys "touch" (killer), custom profile solid roller, jesel lifters, t&d lifterss, etc. 9.4:1 for pump gas. About the best I could build reasonably and have a bravo even hope to live behind it.
On the dyno we didn't push it at all, conservative tune and it still made 695hp at 6200rpm and 615ftlb of torque. took her higher but with the cheapie canton pan and no scrapper i was running for the dyno caused the oil to aerate. Power was still on the incline but being a pleasure boat I was more than happy with these numbers so I didn't push it.
I'd say 700hp is plenty for this boat unless you wanted to venture away from the bravo drive.
Maiden voyage with this power will be this spring. No clue on speeds. you could talk to Will but I would guess 80s no problem.