Leaking Durajet carburator on 79 C10

[72farmer]

I have a 79 LWB Scottsdale with a 305 v8. My dad bought it new. The original 2 barrel Durajet 210. The threads on the carb. body are stripped. Where the filter and fuel line from pump comes in.
I bought one of them oversize self threading fitting's. It has worked about 6 months but now it is leaking and will not tighten anymore. I got to have a new carb. body or go another route. I cant find much on replacing the Durajet online.