71 Dart Swinger rear tire fitment

Bh- nobody can answer the sbc or lbc question without seeing the car. There is a50/50 chance that it has been swapped. It could even have some of each. "
Pretty much everyone will tell you that 4- 4 1/2 backspace is best on a 7 " rim

LOTS and LOTS of threads on tire fitment if you search

See "post your wheel and tire pictures" thread