the date code looks like they could be the original heads. #12's would have come on both the RAIII and standard 400 with manual trans. Also those look like the correct fenders for a '70.
I would be tempted get the PHS on the car before making a decision.
The only other way to be sure what engine option it came with is to look for a build sheet.
__________________
'72 Formula 455HO TH400, Revere Silver, black deluxe
'74 Trans Am SD 4 speed, Admiralty Blue, blue deluxe
|