Big block duster pain in the A$$

I´m building my 68 Valiant right now to a 383/4-speed.
I´m wondering if you choose the bigger Sandwich Engine mounts or the thinner ones?
I saw both on many Photos.
I choose the Trans dapt Engine mounts and they fit pretty well.
Only thing is that it seems to be the Engine sits very deep in the compartement.
But i´m just in the mockup phase.

Anyway, the engine slides in very nice with B-Body HP Manifolds.
Extremely tight on passenger side. Have to grind a bit off the manifold.
Maybe when i use shims under the mounts, it comes up a bit and i have more room there.