circle track rear gear ratio info needed

Thank you JD! well I remembered I had an A body 8&3/4 (with pumpkin) buried in my stash & yesterday I checked & it is ~ 5&1/2 turns of the pinion for one turn of both drums (not sure if it is a sure grip or if I had welded the spiders) so ~ 5:50 to 1. I could try it but that sure seems a low ratio (tires are 15"). when the time comes I will note my top speed & the lowest RPM the engine will see & how much RPM I need to gain going into the corners and all other numbers you guys mentioned that I need & I will hit up the chebby boys to see what they are running. thanks a bunch guys. I wanna kick some chebby ***! I'm pumped. RR