If all else fails, you can drop to a 4.30 gear. It might not cost you more than a couple of hundredths ? From 4.88 to 4.30 is a 12 percent cut in torque off the line. The good thing is the converter multiplies torque longer with less gear.

8..603 156 mph best, 2905 lbs 549, indy 572-13, alky