Interesting comment.The downfall to the mustang 2 stuff is lack of travel (extension) so they don't "work" very well. My TCI was their latest redesign, that gives a lot more extension availability, and it seams to work really well. I've been 1.25 at 3400# on a 275 dr.....street car.
Best thing to do is to set your car up on a plate and then locate the front tires' track width and work back from that.Looking to build a round tube CM chassis thinking 25.2 spec. , 68-73 nova body, 111 in. wb. with coil over A arm setup from my 80 Bu. Trying to figure out what chassis width outside of the 1-5/8" OD tubing. Looking at various kits they vary from 21" wide to 24" wide ,but all are made for strut front ends also.