So, I untightened the bolt under the driver's side biscuit on the K-frame and put a jack under the engine and lifted it a bit. I found some scrap metal that was about 0.150" thick and cut out two 0.25"x0.25" squares with a 9/16" hole in the middle. I then used my angle grinder and slotted them. I threw one in and that was enough to move the headers away from the gearbox. I'm debating about throwing in the second for extra room (possibly between the exhaust and the T-bar on the driver side), but part of me wants to paint them before completely installing them.