7 1/4 Vs 8 1/4

I just bought an 8 1/4 complete A-Body rear end with SG.
The seller tells me it is 48+ inches ID flange to flange and
the 7 1/4 is 51+ inches ID flange to flange. There is only
1 1/8" clearance from my tire sidewall to the leaf spring.
Am I going to have a tire to spring problem??????
Thanks in advance-Douglas