Dennis, I sure am enjoying watching this thread! Luv the Canyon Copper, and the 455HO of course. I don't have an answer for your date stamp on the air cleaner housing, but I'm sure someone knows and will chime in eventually.
Thanks for the continued updates and great pictures! I know we don't always comment much here in the 70-72 section, but we are quietly enjoying!
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Eric "Todd" Mitten
'74 Bonneville 4dr Sedan (455/TH400/2.93 open)
'72 LeMans GT (455/M-13/3.23 [8.5"] posi)
'71 GTO Hardtop (400/TH400/3.07 12 bolt posi)
‘71 GTO Convertible (455HO/TH400/3.23 posi)
'67 GTO Coupe (455/ST-10/2.93 posi)
'67 Tempest Wagon (428/TH400/2.56 posi)
Deuteronomy 8:3