i run 13x31 good years,4.56 dana,trans brake,440 indy head,5000 stall,leave at 4000,not sure on pinion angle,all i can get is 6 inches off the ground seen in pic,has 1.40 60 fts
You can try adding 100 lbs to the trunk and see what it does.Bolt it in as far back as posible. I have 50 lbs bolted in my car under the rear bumper. Very nice car!
I still have my 70 Riviera. It is in storage in my backyard. The lady Sharon with the yellow station wagon is a friend of mine and her and her husband still race.