Hi guys. I am trying to find a replacement coil spring for my 68. It currently has Moroso big block springs in it and they are shot. The car has a cummins diesel in it and I'd like to get the heaviest springs I can. 3 years ago when I built the car these Moroso springs were fine. 2 weeks ago when I sat my new engine in I noticed the control arms were way closer to my roll cage and it appeared the coil springs were almost totally collapsed. I'm guessing the moroso springs just didn't like the extra 250-300lbs I put on them. I've also heard the moroso springs don't hold their rates very long, but IDK for sure on that one. From what I can tell the F41 spring has a rate of 550lbs instead of 475 for a BBC A/C spring. Is that correct? I'd like to get a stock height spring if I can so I don't have the front end going up hill now or the oil pan dragging the ground. I saw Vette brakes and products's F41's lower the car 1" and I don't really want that. Can you guys recommend a source for them? I found some on ebay but would like to order these soon so I can get the car out and make some hits. Thanks for the help guys. Ryan.