Rajo BB head

[Shelbycsx]

I just got this head I believe it is the BB head. Has a high serial number in the 12000 range and has a B casted on top of the head under the valve cover. The eight spark plugs threads are all the same. I don't have a 18mm spark plug to check but a lot smaller than 1/2 pipe. The head has been milled to about .980. It has the large intake ports, the rocker towers are a cast bronze. What spark plugs would be recommended and who sells the best head gasket. How do you tell if the valve cover is a reproduction.