If you want more idle vac I'd try a 2 plane performer RPM intake,that should really boost lower rpm performance without digging into the engine. Proper ignition and carb tuning will also go a long way to clean it up down low. With your compression I would not go to a cam as small as the comp 260H. I wouldn't use Campquest to make a cam choice. If you feel you must change the camshaft just call Tim @ bullet cams. I have given up giving cam suggestions,just too many guru's on the interweb.