I would think to keep the car down, the magic would be in the clutch, it must slip the right amount at the right time, less base maybe, Im not a manual trans racer, but I know that this is where the answer lies, Aronson motorsports I believe could help you with adjustments and proper clutch type,
I know this is my first post, but this link was given to me because I race a 61 bel air, it runs mid tens and I really enjoyed your car and build, I know Aubry from when he lived in my hometown and I think he may remember me, I had the 60 camino with the 348 with a 409 top end and predator carb.
My car 60.s in the 1.47 range with only a small wheelie, It does need chassis work and I plan to add antiroll bar in the rear and limiters in the front and better QA one shocks.
You car has brutal power, you need to get the brick its in working its best, I cant even imagine how hard your car is going to go once you sort the chassis out!!!
Excellent Excellent car!!!!!!!