i have just put a 3540 and chinese stainless manifold on my 33, the problem i have is that the top of the manifold is so close to the cross over pipe that it is heating up a lot, i bought some acl heat shield and made a heat shield, the problem is that at some points the clearance is so small that the heat shield is hard up against the manifold, have been told that doing this makes the heat shield pointless because now its just going to transfer the heat to it and the heat will just come off the heat shield instead, any one have any idea how true this is, i used the acl heat heat shield because its meant to be the best you can get, its two layers of alloy with a layer of ceramic in between them.