340/360 Drivers Exhaust Manifold ID?

I appreciate all the replies, guys. I do know that my book only goes up to 74, and the lst listed casting in my book is 384, that’s kinda why I was questioning it. I know it’s not original to the motor, it was on there when I got the motor. So far, there has been no A body later than 71 where my parts and cars are coming from, but there is a lot of trucks and truck stuff. Just guessing that the motor was in a truck, but again that was just a guess. It also had a pair of 73 and later 340/360 spool motor mounts. The young gun messaged me today and told me he found what he was looking for, but I’d still like to ID this manifold. I saw a clean one on eBay, where it was easy to read the casting number, and I’m sure it’s a 3870337 manifold. The one on eBay didn’t have the stove pipe on it tho, so it was easy to read the casting number.