Restore exhaust manifolds?

[Jakes-66-K10]

I have a set of the 45 degree ram horns I'd like to use on my new crate engine. They are usable, but have some surface cracking on the driver side manifold. I am having them tanks and bead blasted today, but I need advice on what can be done to repair surface cracks and the best manifold paint. Seems everyone has mixed reviews on what lasts and what doesn't. Perhaps someone on here has first hand experience with this.

Thanks!