I put a two speed into my car, had to raise engine and centre diff bout two mills but fits well n meshes perfect, my only problem is the centex clutch setup I used has a larger alloy flywheel over the less in diameter stock steel one so to get it to fit had to raise carby so it sits a bit out of the block, it starts but sounds really throaty can I put some silicone tubing to fill the gap and make it air tight? Will it wreck my motor? Never done anything like this before any input is greatly appreciated.