Need to get new springs on my 68 4 door, and may crank up the torsion bars a bit, or buy thicker one

The ones I got from General Spring are the 6 leaf springs that came on the small block performance cars.......Formula S Barracudas, 340 Darts, Dusters, etc. The 5 leaf spring just sag out too much for my taste. I like a firmer ride for better handling. Not the big block car springs. I think they show 3 different choices on their web site. Mine's an earlier model than yours, but, all the A-body springs should fit the car. It's just a matter of stiffness. They did make a couple of different front eye bolt (and bushing) diameters, but that can be changed if necessary. You can measure yours and let them know what you have when you order so you get the correct ones.