[Ross F-1]

Looks like you've done a LOT of work to get to this point!

How thick is your phenolic? If you use it for the bowl-to-throttle section gasket, with I assume a regular gasket on each side, it will mess up the linkage that goes from the throttle to the accelerator pump and possibly the fast-idle cam's fit to the throttle screw. It depends how thick the phenolic is.