building 8 3/4 489 section

If you are driving the car to the track I would recommend a Detroit locker instead of a spool. I love them. I ran 4.86 with a 30 x 12.5 slick. My car is a 65 valiant. So I know its very light. 2850 with me in it. However I run a converter that flashes to 3800 rpm. With a 2.75 first gear ratio. Yes I was buzzing 6200 rpm at end of quarter mile. I run solid lifter motors, so that rpm isn't hateful. My point is the rear will live and give you fourth gear in the quarter. Never ran stick because I mostly bracket race and I never ever saw a stick car consistent enough to make it past 3rd round. But on the street is a different story. Also if you do go the spool route I would recommend harden axles. I have seen 3 times stock axles snap at the starting line with spools.