What would you build if limited to 372ci - with boost as an option

With what? Big block or small block? Mopar? Stock block or MP block. Hemi gen 2 or a gen 3 Hemi perhaps? Somehow I thought were were talking about stock 340's, 360's or 383's?
Small block magnum. Twin turbo blow through. Small block is what I assumed (maybe incorrectly) that you were talking about in your post.