Blazer Engine Option Question

[DBear]

Hey guys, this might be a dumb question, for a 1971 K5 4x4, if it was originally equipped with an 350 engine, would it be on the glove box RPO sticker. I have read the 1971 booklet on GM heritage center, and it states that a "KE" model, would come standard with a 307 and a 350 would be the option above that. I guess my main question is would it state it on the RPO sticker?? Seems to me all the trucks I have seen with a 350 had it on the sticker..... thanks in advance