The 8" steel wheels were standard equipment on 4X4 Ramchargers and Traildusters. I ran a set with 275's on the rear of a 69 GTX and with great effect. The same wheels are now on my brothers 68 Hemi Charger.
They work good on B bodys but no place for them on C bodys...... Just looks awkward.
I run 275's in the rear on my 66 Polara and love the look. I believe an 8" rim, never measured. I run 245's on the front on a 7" rim, that's what I had. Still, they don't look out of place.