One of the issues those older Ford chassis' had with brakes, was the brake fluid. After it got hot it would create/retain water and eventually lose braking power.When you do the brakes, check the front brake lines carefully and replace if necessary and then bleed the system and refill with synthetic brake fluid.
The 460's do like free flowing exhaust. My 1990 Jamboree had a 460. Back then it had a catalytic converter. The exhaust came out of the engine at 3" and squeezed down to 2.5" at the rear of the converter and back to 3" again. I cut the cone on the back of the converter at 3", added a stock 5 ton truck muffler, 3" in and 3" out and the thing ran well and cool for many years.
Don & Mary
2019 Newmar Dutch Star 4018 (Freightliner)
2019 Ford Raptor