It's some kind of GM small block, they have what are called siamese exhaust ports and it makes the middle two closer than the others. It's actually bad for flow. Never seen a big block motor with those ports.
GTO is used in a local TV show "Republic of Doyle", the Ford is a replica but still a rather nice example, and the Merc is a high dollar build, has an LS swap and other goodies.
YESSS. I hereby declare this as a custom page. Any hot rod or muscle car posted will get blown to bits and the poster will receive a kick in the nuts. Go.