Mike,
Your best bet given what I believe to be your objective is to seek a firm that does mandrel bending, which is the only way to achieve the '1/8" or less distortion' in curves specified on the original engineering drawings. Nothing that I've seen on the market at present meets that standard for any pre-WWII Ford pipe. You might start by asking Mike McKennett in Portland who he used to produce the flawless '32-'34 pipes he once offered.
The supply of pre-WWII NOS or quality NORS inlet, outlet, and crossover pipes has pretty well dried up and as a result I'm employing used originals in some cases.
Go in with a proposition to make a batch and then sell a few so he gets a slice and isn't just doing you a favour. I'm sure there would be a good call for a decent facsimile of a good part.
Mart.
Kube, are there any Ford specifications on these exhaust pipes that a guy can use to have a new one custom bent? I have a custom exhaust guy near me that is really particular and would make one for me provided I had the specifications.
You might try Waldron Exhaust. 800-503-9428
to see what they offer.
They make a good quality replacement muffler for a 1940 Ford.
Kube there are companies that could scan your NOS pipe & bend exactly as scanned . Could even do in stainless if you wanted. Call Brown & Miller Racing Solutions here in Charlotte they have the equipment to do this. They are not an exhaust place but have the equipment to do as I have stated. Once scanned they would have on file for future pipes .
Cheers
Tony