XR286HR COMP CAMS

3200 LB DEMON
2800 stall
3.91 gears
2001 Magnum roller block
stock stroke, and bore
edelbrock performer RPM MAGNUM heads
edelbrock air gap
compression 9.5 is depending on deck


Building this motor, and Ive decived on the xr286hr cam. The specs 20-813-9 - Xtreme Energy™ Retro-Fit Hydraulic Roller Camshafts appear to be for 1.5 rockers judging from the lobe lift. Does anyone see any problems with running 1.5 rockers vs the 1.6? Id like to keep the vac up enought to run the MSD Atomic EFI I currently own. If I ran 1.5 would I get more vac? How much would this impact the RPM range of the cam? Trying to wrap my head around this sorry.