Hi Hetzi,
here are some photos I took of the M60A1 at Tankfest 2019, in Bovington, Dorset which may be of interest in your quest for the correct colour scheme. I can't swear that the scheme is 100% accurate, but I know the museum goes to a lot of effort to preserve their vehicles in as authentic a condition as possible.
Note - the M60 really is a lot bigger than a Churchill tank...