Help with sb combo

m putting a mild 340 back together to hopefully run this coming season. Im torn between what intake and cam I should use. Car will be raced not street driven, only the occasional car show.

340 - .30 around 12 ish comp
TRW pistons
Worked stock 340 rods
318 crank
J-heads milled with a lil work and large valves
904 w/9 in conv stalls around 4500+ on fb
750 Holley

Before anyone says anything about getting new pistons/rods, that isnt an option. Im using what I have unless something ends up being broke. that being said what intake and cam do you all recommend? A few options Im considering

296/ .557 cam
296-298 . 577 int .555 ex cam
or suggestions??

Mopar single plane or Air Gap??