i was watching monster garage with jesse james,,, and he had some well known bike builders with him,, they ended up drilling the inside as well as maching it ..then polishing the inside as well and of course a raked front end...the engine had a 50mm carby hanging of the right side at right angles,,but it only kicked out 115 hp and a close torque as well on the dyno... the workshop guys said it was old school with a modern engine set up ..regards oldbiker