Need header ID help..

I have the Dr. side header from My ex Cop-Car Dippy, which was from a diff pair than the Pass. side. I have the mate for the latter, but not the former, I was told it was for an early C-body.
The flange has "46110","4",&"75".
This doesn't hit as Hedman or Hooker part#s, & I assume the 4 75 is a date but... If anyone has old catalogs for other header mfrs. I'd appreciate it.
"B" eng. unit, Thx!