Best 318/x-head /hyd cam combo

Presently I have a factory 73 Cast iron 340 intake-the heat risers are NOT blocked off.
I'm running a stock converter right now-the oe dart manual said stall was between 1800-2200 which WAS ok with the Comp cam BUT with the 508 cam I realize would not be nearly enough.
The rear tires are Radial T/A s 245/60r14 on Magnum 500s(14x7) i'm putting a taller 15 size on soon. Haven't settled on diameter yet and do not plan on moving the springs in just yet. On the street the 14" tire/4:30 gear is fun but impractical for the track.
The frame is tied(US Car Tool) and the battery is in the trunk.It hooks up nice on the street
The Holley has 69 jets up front/82s in the back and a 5.5 power valve. squirters aren't touched.
So at this point if i run the X heads with the cam I have(477-488) it may have the flow head wise but the cam won't optimise the flow and without more compression this is an excercise in futility?
So add compression bigger cam taller tire and looser converter