Thanks. I got the Egge Part numbers for replacement valves along with lengths and diameters for all. I too have the motor manual specs and I agree that we might as well include them since they are important.
As to the head casting numbers, in the info you posted there are GM part numbers and what shows as STENCIL NUMBERS. If I read this correctly, it is the stencil number that would appear on the head as what we know as casting number - correct? I just want to be as accurate as possible - knowing that there is such WILDLY inaccurate info out there these days and would prefer not contributing more to it!