Wanted- 400 road bike

[MTBiker]

howzit
Im looking for an old preferably 400 twin road bike. i wont mind 500 or 650.

Looking to spend 4-8 grand.
I currently ride a honda nxr, but unfortunately can't afford a nice bigger dual.
Im looking for a project bike, something that i can fix up and possibly turn into a retro, maybe cafe racer style bike. to be used as main transport for varsity and such.

Ideal bikes would be a cb 400, or similar.
It needs papers and preferably WC based.
Doesn't have to be running.

Thanks
Mike