1969 Dart Swinger tires

If a 340 car, they would have been E70-14s on those 5.5s, which would have replaced 7.35s IIRC, which would be equivalent to 185s,lol.
I run 235/60-14s on 7inchers, on the front of my 68Barracuda. I recommend nothing less for spirited driving. Even these are borderline inadequate, with big T-bars and a Big anti-sway bar;they do add a little excitement tho in the corners.
235s seem reasonable as to braking. And new BFGs make a wonderful howling moan when driven on the edge.