318 exhaust manifolds on a 360

Thanks.....I know I'm stubborn, but that particular attribute comes in handy sometimes...LOL!! Like when you need an annoying problem solved!!
Here's another manifold that looks interesting and the exit hole looks large but I have no idea how big the hole actually is?? 79-80 5th Avenue 360 engine. The profile looks thinner making it a better candidate. Also the location of the exit hole keeps the manifold from hitting the steering shaft. Unfortunately it's not a magnum manifold.
Has anyone ever tried or checked this one out??

Treblig

Just heard back from the seller of the 5th Avenue manifolds....1 3/4"

Oh well!!

treblig