1971 EV2 Dodge Demon "Sizzler"

Those 7.25" rears would grenade behind a 170 / 904 combo , with an old lady driving .
Total junk .

The big bolt-circle-pattern means one-of-two things :
1. It's a "B" Body piece
2. Someone put axles in an "A" Body diff that have the 5x4.5" bolt circle

The 1968 Hurst/Hemi Darts & Barracudas had standard-width 8.75" rears ( early-production T-Flite-equipped cars ) and Dana 60's from the "B" bodies .
This is one of -- if not the prime -- reasons why their rear wheel well openings were carefully (HA!) modified by Hurst-Campbell : clearance .
Typically , the "29" body style cars ( Duster , et al. ) don't / won't have the interference problems , as their quarter panels were generously-proportioned .