I was able to get about a quarter inch out of moving the brake switch screws in. I found some specs. in the factory assemly manual that want the lower brake assembly 13/16 of an inch from the firewall, so that is now lined up properly. I thought there might have been a failure in the weld at the bottom there but don't see any signs of failure or repair.
If anyone has any ideas or dealt with this in the past feel free to chime in, I can't figure out what's different with my truck to cause this.
In checking the pictures offered by BigChevy I could see the boosters mounting bracket location in relation to some rivets in the frame and mine is the same.
Looks like I'll break out the hacksaw after work tonight. Martin