fuagf -- that's one of the old big-blocks, a third-gen or C3 ( http://en.wikipedia.org/wiki/Chevrolet_Corvette ), running twin superchargers and a HUGE cam on what may well be a (potentially well over) 500ci engine built using one or another of the specialty engine blocks developed in particular for certain classes of drag racing
to be running a (large; still nailing that down, but looks like a 472ci, or 7.7-liter) Chevy LS-generation small-block (Katech block), twin turbocharged -- very much unlike that one, will idle quite smoothly and a lot more quietly and behave very well and predictably under light throttle, perfectly fine for nice and easy driving around town running errands, even in stop-and-go traffic, no problem