"G" Body suspention tips ?

[CJohnson]

Hey there, I have a 1984 cutlass that I am slowly turning into a stock eliminator but right now its just a 13 second bracket car with a 355.

I just recently swapped out my 7.5" ten bolt 3.73 posi, for a 12 bolt 4.88 posi and i am running 30x9 goodyear radials with the steeper gear. to make these tires fit I had to run cargo coils in the rear does anyone know if these work well for weight transfer in these cars ?

I'm also using the stock upper control arms (The pinion angle is way off and i am getting major shutter off the starting line)

I ran my car at the National open last weekend for the first time with the 12 bolt and like i said i was getting big time shutter off the launch, and also my 60's were all over the place from a 1.956 to a 1.880 and it felt like it was hooking up every pass
Will a set of adjustable upper control arms fix the in consistancy off the line ? and is there any other tips to get "G" bodies leaving the starting line better ?

Thanks,
Craig - C693