M1 Tunnel Ram Top Plenum Volume Reduction with Photos

Well I guess I got a tunnel ram and worked on it before I had to much of an idea of how things effect the engine by having one and the things I have read I forgot. Mine made the best torque and hp numbers however with a 2 inch super sucker tapered spacer. Open spacers killed 24 HP.
I guess I need to study some more about plenum volume and rpm. Plenum volume and carb sizing, what makes a carb act bigger or smaller.
I need to get a Bridgeport mill also, what an awesome tool.