The line to the MC is attached to and follows the bellhousing crossmember in the stock location, and it is 2.5 inches from the exhaust pipe. The MC is just off center of the exhaust pipe and is 5 inches from the pipe. I have bought some "header wrap" to wrap the exhaust pipe and will see if this solves the problem. I will also slightly bevel the sides of the brake shoes to prevent possible binding. The old shoes were traded in on the new shoes.

PS: The truck is a '50 1/2 ton AD!, and thanks for
your posts.