Eric, got a question.
I'd like a set of doubles for the rear of my 68 dart which is still leaf sprung, but wonder if I could get them already setup for coil springs as well, so if I decide to go tri-4 link later I wouldn't need shocks as well? Is this possible or are shock lengths and travels massively different?

11.48 @ 120 with a 1.80 60' 318, stock 1.88 heads, stock 904, Pump Gas, 13 lbs of boost.

9.94 @ 134, 318 on pump gas, 14 lbs w/ Eddies, transbrake 727, 3600 lbs, 3.54 gear and 28's.