I’ve wondered if there would be any controversy if this had been a custom painted 318 car that was repainted back to its stock color. My guess is no.
I don't think I'd do that to a 318 car either.
A friend of mine just bought a '71 Cutlass that was painted in the late 80's and had an LS7 dropped in it. It's blue with gold splash graphics and some silver stars on it too. It's not a rare car at all but we're all begging him to leave the paint alone, it's just period correct cool and he agrees. He's not touching the paint!