Hey Fatboy,
With the booster set up, you will have to decide whether or not you are using an auto or not. If Auto, then the booster will fit, however then you have to look at the pedal set up.
SGO aka George may be able to help you will a VN set up, However I first tried to put VR pedal assembly in and would have to have lengthened the pedals to get it to work... I don't think that changing the pedal length is legal either. Lucky enough for me that th VT booster, and pedal assembly all bolts up together and from starting with them installed in th VT to fitting them into the FE took a total of six hours... The pedal length is perfect onto the ball of your foot. I then cut the frame from the original FE pedals and welded it to the Vt ones, this prevents firewall flexing and when done looked pretty good.
I was then able to go through Hoppers stoppers to get the VT brakes to fit HR drum stubs and with the VN Diff on the back of the car the calipers are again matched to the VT system so had no worries with registration.
Hope this helps
Jason.