I've heard a lot of bad things about cutting springs, changes spring rate, effects hardness, etc. But about 20 years ago I had a '70 Chevelle that I put Station Wagon springs in to stiffen it up. It set too high after the swap, so I cut a loop off the springs and it worked out perfect. Every once in awhile, the full length headers would scrape on a good bump in the road, but it was rare.
Bottom line, I was very happy with the results, but you have to BE CAREFUL. We tried this again on a different car and it was a disaster - the car set too low and forget suspension travel.