I have gone to an 8 rib setup with 3 bolt tensioner timing cover. I am trying to figure out what belt size I need. I put a string around the pulleys and it measured 82 3/4". I am wondering how much shorter I should go for good belt tension. Set up is a Vortech supercharger with 3.125 ultra grip pulley and 15% overdrive balancer. I have deleted the power steering and am running a short belt. What do you guys think?