Hello Roadsters, I am in the process of up-grading my brakes to remove the 97 Mustang foot box and replace with the wildwood master cylinders.

Questions:
1. Has anyone done this upgrade with the body on?
2. Is it beneficial to do this MOD with the body off?
Note: My car is not painted yet. I would rather try the upgrade with the body on vs. remove the body.

Thoughts, advice, experience?

Thank you