Edelbrock intake, - an air gap, rpm or even a ld340 would all be good choices. Your holley 600 wouldn't be an overly bad choice, although it may restrict power around 6000rpm and up. Depends on how high you plan to rev it. Actually one interesting combo I would like to try in an applcation like yours would be a ld340 intake with a holley 650cfm spreadbore double pumper. LD340 intake is squarebore but was cast with extra meat in that area so it could be hogged out to spreadbore. And that holley should flow well and the small primaries should give good mileage/throttle response. Don't know about how well that cam would do for you though.