A few issues to work on..

[David]

Once you remove the manifold to replace the gaskets, which isn't a hard job, check the actual manifold thoroughly for any cracks. I found one in mine and had to replace it.
The replacement was at my door within a week from America

Curious about current pricing for the intake, I Googled around for US suppliers, and was surprised to find that almost no-one is showing stock for the Ford M-9424-P46 at the moment. Summit the supplier normally recommended, do not have it. Maybe stock is drying up, even in the US.
Dorman may end up by being the only route to follow in the future. Pity.

David