Another note on weight and it's effect...you really need to get the car on a set of scales if you want to know where the weight is. It's really the only way of knowing what effect the changes you are making will have.
Total wet weight of the last "Butler" we set up was 2783 with a Motorsport crate 351 W. (Iron blk, al. hds and int) and a tremec TKO.
RF was 641
LF was 615
RR was 768
LR was 758. That was a F/R ratio of 45
54%.
You can do the RF/LR and LF/RRcrosses, as well. It had a Left/49.3%Right/50.6%
That car with me in it at 157#:
RF was 641
RR was 806
LF was 659
LR was 834
Notice how my weight brought even a little more rear bias to the table. (F/R 44.2/ 55.7) The L/R ratios basically swapped sides. That was one of the sweetest handling cars I had ever driven! It wasn't over sprung, it had the right sway bars on it, a very rigid platform, and BALANCE!
(numbers were rounded off...but you get the point)
Thanks.