15x7 rally's and new rubber !

What is the rpm difference between the 3.23 and 3.55 at 60 mph? I have been wanting to do and have the pumpkin to swap in and am still debating about it.
honestly not 100% on the rpm difference .. maybe 200rpm ? .. i think im somewhere around 3K at 60 ... i will have to pay more attention on my next drive ! i do know it is very calm at 60 vs my '65 coronet w/ 440-727 4.10's !

Those wheels look great on that car. That is a nice ride. Thanks for posting the wheel tire combo. I have been thinking about putting those on my 67 Dart and I think you just made up my mind.
Thank you .. glad i could help !

They look good . I'm putting the bfgs on my ride with the 15 x 7 cop wheels 225-60-15 up front, 255-60-15 in the rear.
That would look good with some dog dish caps !