Luckily the intake carb height is close to the Weiand and the M1 single so I can swap out etc and my airbox stays lined up with the air intake opening. But there's no room for any spacer. I do have the Holley fiber heat sheild that is approx 3/16 thick, it was originally four holed but I opened it up. This winter when I'm doing some changes I may look into modifying/changing the engine mount biscuits so I can drop the engine some. Then I can play with carb spacers etc. I'm not cutting down the divider but doing the runners like you say would be it for mods.