I agree with Jock and weldair. I prefer not to cut a coil unless there is no other option. I think the 4 cyl coil spring will work in your '48 1/2 ton truck. The two things to keep in mind are spring load and spring rate. The spring load is what keeps the front end of the truck up. Your truck with small block Chevy motor and TH350 tranny will have in the neighborhood of 1600 lbs of weight on the front end. And as I said previously a 350lb spring rate should be fine. If you can get your hands on a MOOG coil spring book you can look up the spring load and spring rate for '74-'78 Must II and go from there as a reference point.
