Does the added thickness give you any issues with the input shaft on the transmission? Or as long as the pilot bushing still has some enagement it is ok?
It's all custom stuff. Example, adding a T5 transmission usually requires an adapter plate to move the trans away from the engine on the early Chevy pickup bellhousings. Using a motor plate might allow you to use a thinner adapter plate. Maybe even fit more clutch in there. When I adapted the Ferd 302 and toploader, I had to machine down bellhousing parts to get proper engagement. In the dragster pictures I posted, it had a 2 speed in it, but ultimately used to be and was restored to a direct drive. Which is a whole different animal for engagement and such. Like Jerry says, you find the stuff that wll make it work, like a different pilot bearing.