How long are those bars on that kit?
My old foot brake Duster had a set of 32.0 inch long ladder bars with only three holes in the body cross member that the ladder bars hooked up to, Leaf spring car with floaters also, that car ran the quickest and fastest in the bottom hole I think it had 3 way adjustable Completion Engineering rear shocks, 70/30, 80/20 and 90/10. Way better choices today
Looking back now I had a lot of fun with that car and made some money with it also