Instead of 650Hp would a better question be what is it going in, and how fast do you need to go? 11.50 and faster requires a cage and other stuff that can make the car a pain on the street.

My observation with power adder cars is that no serious bracket racer here seems to use them. Too sensitive to heat fluctuations and harder to dial in. Cars that do have them are fast, but seem to struggle going back to back on the same dial in. Most of the guys who have turbos, blower, + nitrous are the test and tune guys who just want to let it rip once every few weeks for fun. The guys who are more race than street all have simple single 4 barrel big blocks. If it breaks they can get it going again before the next race with minimal downtime and expense.