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.

Do you have a part number for the 2-speed transmission you used?

What 2 speed is that?