Denny,
I have two Chevy 235's. One for the 55 2nd and other for the 53 3100.
I painted one Chevy Blue. There are two Chevy Blues. So, the block is one and the cover (and some other parts) the other blue. This way I figures some of it will be right.
The other is gray. I call it Chevy Grey. It is really just Grey.
The 55 gets the Blue one and the 53 gets the Gray one.
It works for me. Zoom Zoom