350 rocket

I have a 1978 olds cutlass, it currently has a 260 v8 in it. I bought a 1975 olds 350 out of a cutlass from a friend. I havent ran the numbers on the block yet, but I was told that if it was the darker blue color it was a 350 rocket. The 260 olds in the car now is a different color blue like a teal. Thanks for the help ahead of time.

I think the 1968-1976 350 rockets were painted gold, the 1977-1980 models were painted GM Corporate Blue.