68 GTS Big Block Exhaust Manifolds

I have a 68 dart Gts v8 upgraded to a 383 big block, it has hooker fenderwalls which i need to change before sending it back to australia. how do the tti,s fit out of the box? I was going to put schumacher engine mounts on it an the tti's as I don't like the shape of the schumachers..... Oh yeah currently a auto