340/360 Exhaust Manifold On A 318?

Anybody running a 340/360 exhaust manifold on a 318 ?
Any issues I should be aware of ?
If I went this route do I use a 340 or 360 exhaust gasket ?

I might go this route.I like the reliability of the exhaust manifold,plus I wont have to change any of the auto shift linkage.Then down the road when I get a 340 or 360 motor I would be ready to go.

Make sense?

Any insight would be appreciated.

Thanks
John