Wow, gives me hope for when I remove and sell my 670 heads that were just gone through a couple years ago. Looks like those heads had a lot of rust on them at some point judging by the looks of the texture around the numbers.
http://www.TheFOAT.com/92GTA 1969 Pontiac Firebird w/535ci IAII aluminum block, Dailey dry sump, Holley EFI (full road race build). Primer black w/black interior. 1992 Pontiac Trans Am GTA w/SLP Performance Package. Dark Jade Grey Metallic, grey leather, T-Tops.