Someone recently asked the same thing on the /6 forum, I answered them. Was that you?
Rebuild what you have now. If you don't think you can, check with some of the site sponsors, I've heard Mike's is pretty good.
Yes, that was me. I am not sure my Carter carburetor can be rebuilt.
The secondary's are stuck closed and I have been putting cab cleaner a PB Blaster on it to try and free them.