How much Hp and Tq would it take to turn an BERK AAA or AT 9.5 impeller at 5200 rpm, seems to me if you opened up the nozzle diameter a bit you could get a killer holeshot and descent top end even on a fairly heavy family cruiser. My gut says it would be a big ci engine tuned to make all its power at about 5K... hard to say for sure
666 hp, and yeah, that would take some big cubes.