You guys got me scared of tti headers!

How on earth would you do that? Did you take them off the k member and put a shim between it and the mount? I don't see how you could shim between the mount and the engine though.
Simple, you can grind the slot for the thru' bolt to drop it a little depending on pan to k-frame room etc., and You can grind/cut to fit a washer for the thru' bolt to tack weld
to the spool mount ears on the frame so that the bolt stops higher, You might have to cut the washers on the nut/bolt to clear the rolled edge. Or, if You know exactly
how much You're going to raise it You could MIG the bottom of the slot up.