http://www.fordgarage.com/pages/stipecamshaftspecs.htm
Stipe touring cams are very close to stock B cam designs,yet stipe uses a clearance way closer than .022 exh,they are down to the .012. His designs are nearly the same as the B cam,Ford recommended .022 to rest the exhaust valve on the seat longer to allow additional cooling.Modern valves handle heat way better,allowing the later designs to make maximum use of the lift for power. Model B parts can be used in a model a engine with great results,side bowl carb and mechanical advance distributor are two of the great advantages designed into the B engine that work great on an A engine..the B cam is another.