cars a 63 already switched to a dual m/c, but with power brakes. was gonna remove them to make room in engine bay( mostly street/strip car) had to run a vaccum can with my old SBC in it. still 4 wheel drum.
55 i already did a dual conversion. all my 63s ive had have been power brake. I know on a G-body i did, there was a plate that went there when you removed the booster