Would they have put the Ga heads on a W-29 442 package on a 1972 U code Rocket 455? If so, what should be the HP be?
From what I understand, Ga heads were always with the W-30. Just gaining knowledge on this topic

 

i have Ga heads on my 455 in my 72 Delta 88, engine is numbers matching, can say about heads, know its had a valve job/head gaskets by PO

 

Every single 455 that Olds built in the 1972 model year, including the W30s, came with GA heads