[John Rogers]

I have the large one on the nearly stock 91`4 with stock torsion bars, 160# rears, Bilstein sport shocks and Yoko R rated 205 size tires and it corners as flat as a pancake. The 914 track car has the smaller bar, same shocks, 200# rear springs, bigger torsion bars, Good-year Eagle slicks and it WILL NOT corner flat, gets tremendous over stear if I try to flatten it out, probably due to the slicks???
As Dave said it is semi-guessing game and you need to gather as much info as possible. I would opt for the bigger of the two sway bars since it sounds like the car will want to sit flat with the DOT approved tires.Good luck.