It should be a nice street cam but don't think it will get you the 600+ hp you want. I would guess more around 550. Plenty of power to get an A body into the 11s. And it would really like more converter than the 2000-2500 you mentioned. Why put a stock type converter behind a modified engine that has a higher powerband than stock? 2500 is pretty much what a stock 383 RR converter would stall to. The stock converter in my 16 second 318 duster will flash to 2000. A good 9.5 or 10 inch converter that flashes to 3500ish with your planned engine would give you a good kick in the *** and be plenty streetable.