Performance stuff for the 6 is hard to find. I have seen heads made for them, but that was in some of the old Hot Rod mags from the '50's. Ford's flathead six was never really seen as having much potential for performance. It was a low speed work motor, max torque and HP were made somewhere around 1800 RPM. For the cam, you might have to have somebody custom grind one for you, finding one off the shelf will be near impossible. Any good machine shop who has some performance background should be able to help you determine what a good amount to shave would be w/o making compression too high. Other work that is done to the V8 enigne should also work, such as releiving the block, a good 3 angle valve job, etc.