I'll keep saying this till someone does it. We need a new GMC Speed Manual! A lot has been done to these engines since 1955. Chrysler rear seals, Hudson rods, V8 valves, new porting techniques. Builders are using HEI ignition, coil packs, fuel injection, superchargers, turbos and much more. Old sources have disappeared and new ones have turned up. This needs to be done while the guys who have continued to develop these engines can contribute. Beater
