Thanks Scott. The FT shows the same thing. The guy said it was a hemi car, then later said he doesn't know what motor it came with.
Has a wedge K frame, but it does supposedly have the torque boxes.
Don't think there is a build sheet.

CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax