The springs are fresh Cranes, and I have them set to 120# on the seat, give or take 2#'s. Open pressure is a little over 350#'s. I have a friend that had a MP distributor that malfunctioned at the same rpm as I am having problems. He fought with it for a whole summer, and replaced it with an MSD setup, which cured his problems. I just ordered a MSD distributor, and hope to have 4.10's installed this weekend, (29" tire). The odds aren't in my favor to make the track again, but I am trying.