Help! I Need More Opinions!!!!!

oK, SO I just bought some used cast iron heads from this guy to put on my car. he said they were gt-40p, but it didn't say so anywhere, it just said "gt' whereas on other gt40p's, they've said the whole thing.

my question is, are these real gt40p's, or just stock heads? either way i won't be mad, i got a killer deal on them, $180, and they've been rebuilt 10k ago, including crane 1:6 roller rockers, 3-angle valve job, and everything else you can replace.
what got me thinking was that he told me that he used his stock headers with them no problem, and i thought that couldn't happen with gt-40p heads, any help would be f@#$*% awsome! thanks a lot guys


oh yeah! and when i put these on, can i just buy oem type head gaskets?
thanks again