Cylinder Head Porting and Power Production

Going by the 2.06 hp per cfm my 470 stroker has standard port stage 6 heads that flow 320 intake. 260 ex. Motor dynoed at 655 hp 627 TQ. 108 Volumetric efficiency. Cam is a Comp solid roller. .625 lift, 275 @.050 108cl. M 1 intake and a 1050 dominator carb. Can this be improved with a bigger cam. Thanks. Kim