I have a 72 camaro factory small block car. I'm putting a big block in it and I'm unsure which mounts to use. I'm using hooker super comp 2 1/8" primary headers. The car come from the factory with the clamshell style mount, which mounts to the engine and the rubber part is on the crossmember. Does anyone know what engine mounts I will need and if I need the old style (rubber on engine) or the new style (rubber on crossmember)?