63 Dodge Dart, now let me see;)

maybe use a chinese bbd made for a 318 and fit the jets from your /6 one? they are cheap
neil.
https://www.ebay.com/sch/33550/i.html?_from=R40&_nkw=chrysler+bbd+carburetor&_sop=15
I have used a couple, limited use and no issues. Yea they are cheap enough! YOU might buy one and find it to be junk! China junk, that is!