i think that's a good decision. run it, tune it, and then make a decision about installed centerline, especially with a cam with advance already ground into it. if pump gas is a concern with 10.5:1 compression i don't think i'd want the intake valve closing sooner than the stated 68 degrees ABDC. the suggestion about a solid lifter cam is very sound. you will find a solid cam to have more flexibility. big hydraulic cams just add to the misery index.