Smog heads with 2.02 intakes cut in and no port or clean up work=as low as 201 cfm without a deep 70 throat cut, then the rest of the restrictive stuff... 315-330hp around 6k
Dyno numbers are hard to figure....
Summit sells a 383 chev stroker (ya I know) with a .480 / .230 cam,
2" intake valves etc and dynos 310 hp and 360 ft. lbs?