Is there anybody out there producing a plate where you can weld your own headers/intake to?
Dan McEachern has made them, maybe still? His email can be found in this thread: http://www.mtfca.com/discus/messages/29/46038.html
Paid to create a "pattern" (aka computer file) to make one for a Rajo C-35. The process was as simple as could be; laid it on paper gave it to guy with a CNC waterjet cutter. He cut it from 3/8 steel.
I am aware the center port on mine is not quite right for a C; that will come in a later step.
Point is, for not much money, you can have one made for your specific needs.