Are you making your own flanges? Why don't you just base the next set off a set of Clifford shorty headers but add a pocket on top of one of the tubes that will accept the stock one or two bbl choke coil then sell them for half the price of what Clifford sells them for? It is a proven design that works and I know a ton of guys would buy them because the lack of any choke is what is keeping alot of guys from running them on their street cars. Hell I would probably buy 2 sets from you myself!
I would add a choke pocket to the top of one of the tubes on the set of cliffords I have in the 48 chevy but they are ceramic coated and I am running a Holley 4bbl.
You should be able to make a set in no time at all!