2004 800cc Bonnie

Hi this is my first post on here so a quick introduction is in order. I am 56 and been around bikes all my life, five years ago after getting mashed in a couple of big offs I decided that I was bored with riding on the road so I moved from the street to the track. I now sprint and hillclimb an old Ariel.
I am thinking of buying a 2004 Bonnie to build a straightliner, what power can I expect to get out of this motor and what is available off the shelf in the way of cams and high comp pistons? I would like to run at about 12;1 CR on Methanol initially with the engine normally aspirated but am toying with the idea of supercharging, whould the crank take this? Your input much apreciated.
The Badger

 

Where would I go to get a full spec for this engine from please? I would like to know as much as possible about the engine as possible before even thinking about doing any work. the minimum data I would like is compression ratio, how much the valves clear the pistons by, cam profiles and valve timings.
Given a standard engine developing 61 BHP, I should think that at least 90 would be possible before thinking of NOS and forced induction, Of course this will affect engine life quite considerably!
I now need to persuade my mate to let me have his bike for a lot less than he wants for it!