Tossing Around 273 Ideas

If one were to build a TT273 what size of carb and turbos would be adequate for use?

Cam would be a solid roller in the mid. .500's in lift. 110CL and 230ish at .050. Heads would be either 318 or 360 with 1.88/1.60 valves.

How about a 650 with two 58mm turbos? Too much turbo?