My 1982 Direct Connection "B-RB Engine Racing Manual" shows just the 8.5:1 400 in a 3200# (less driver) Duster with 4.30 gears:

Stock Hyd 12.35 @ 110.27
Street Hemi 12.17 @ 112.60
.484 11.91 @ 115.30
.509 11.82 @ 116.61

Oh yea, I do reacll those articles. I know we're talking a back door factory built car (aka "a ringer"), but that is a HEALTHY 400!

Especially considering that I recall as it having a OE iron intake and a Thermo-slob carb.