I've put this in your thread about what would people buy if you made it, but I'd like to buy(hopefully today):
A set of 5" tall cast aluminum valve covers for the 5.9 Magnum engine.And setup to clear the alternator in the stock location.You know, like the ones you sell on your 408 Magnum roller engine.
https://blueprintengines.com/products/383-ci-stroker-crate-engine-small-block-gm-dressed-longblock-carburetor-bp38313ctc1