Desperatly seeking brakes! 69 Dart
I feel your pain,and am in the same dilema.I have a set of small bolt Rallyes,and a set of small bolt 5.5" powder coated steelies.Both with new radials,with small bolt Kelsey disc brakes on the car.Would love to go big bolt.
The later (73-up) disc's are the way to go.Parts are much more available and much cheaper.
I guess sooner or later you just have to bite the bullet and go for the big bolt disc's and big bolt axles.
It looks like you have a set of rallyes,plus Cragers.Selling those would put you in good shape for the big bolt upgrade.Then you have a plethera (did I just say plethera ?) of wheel choices.