I hope someone can help me with some information?

My bike is an 1986 FXWG solid mounted EVO engine running a Baker 6 into 4 transmission with the tapered main shaft and key. clutch is a Rivera Primo 7 plate Part # 1056-0003. i am currently in the process of building a hot S&S 113 with Mikuni carb and head works it should make 120+ HP.

I'm thinking the week spot will end up being the stock Harley Clutch Basket/shell Part # 37707-84A and or the taper and keyway.

my two questions are:

I have emailed Baker and several aftermarket suppliers and still waiting for responses.

any assistance would be greatly appreciated