That cam is the CompCams FS XE262H-10. Combined with Performer RPM heads and 1.6 rockers, I'd say 400 FWHP is very possible in that engine; assuming the CR is 10 or better.
But there is no way it needs 1000CFM worth of carburetors.... One of those 500 Edelbrocks would have been more than adequate to feed that engine.
Extra carbs must make it look faster, I guess...
