Carter Single BBS Issues

Correct. Don't bend the arm. Look close at the thermal spring. There is a bolt & nut, with adjustment marks. Go toward "R" to make the choke tighter (rich) or "L" to make looser. I fooled with that for years on my 69 Dart slant, having to tweak it between summer and winter. I didn't know the real problem was that my choke pull-off was bad. You see the pull-offs cheap on ebay occasionally.

Down the road, it you want more sophisticated operation, you can get an electric-thermal choke from a later slant (~1976-1980?), at the junkyard. There were also aftermarket electric chokes. I bought one from J.C. Whitney catalog long ago.