I know I have seen shops that will build a carb to suit an engines specs but can't remember who. I think there was a couple, any names come to mind?
Bob at Competition Carburetion was great to work with on my Winfield project. Of course, his specialty is modern 4 barrel racing stuff, give him a shout
Allstate Carburetor in Central Islip NY. They’ve been around quite a while. https://allcarbs.com/contact/?v=eb65bcceaa5f