I agree with a VCCA expert (as does Jim Carter) regarding the shades of gray for Stovebolt (truck) 216/235 engines.

A lighter gray with little/less/no blue, in 1954 trucks.

This has been discussed here at great length (several years ago)..

No one has posted GM documentation of truck 216/235/261 engine colors/codes.

However, Chevrolet did state "the new [1954 truck 235] engine is painted gray".