Keep One simple thing in mind. He’s not reinventing the wheel here. He simply and I said simply wants a 290 cfm head. Not the head WE want but one aimed towards his business of supplying 400-500 horsepower crate engines at a reasonable cost. Don’t make it complicated as it’s aimed to offer a product at a lower price point.
For me the basic plan for a 290 cfm magnum is good and fit the needs of 90% and would be interested in one at the right price point for my magnum engine, that's more than enough for me. To me anything else is bonus.