What are you going to run for boost? My engine builder has a 306 single turbo that makes around 720rwhp in race trim with 19/20 psi through a c6. He runs the holley. HP, is an estimate, car dynoed 608rwhp last year, now tuned though is running 140+mph in a 3500lb car
Look at NMRA Real Street...no mods to the upper/lower intakes. The top running cars run the TFS Street, no Track allowed. They are pushing 550-600+rwhp.
you'll have to up the boost, but very possiblie , there are stock 5.0 with just ported heads and ported stock lower and mild cam(e b f 303) , oh yeah and 1 or 2 turbos) pushing 500-650hp, but useully ends up with a split stock block
with your 331 and supercharger, hell yes it will be capable and then some