Correct Block Color - 4/20/71 Build 340

I had a 71 340 Duster with a blue engine and I believe it was about an April 71 build. I don't have the car anymore and back then nobody really cared about build dates or build sheets. I bought the car in August as a leftover because I heard they were destroying the 72 340's. Lower compression and no more rally dash, not even an option.