[patrickt]

Wow, that's a really great question. What I would do is pull the rockers off and put a gauge on the push rod and get an accurate measure of the cam lobes for intake and exhaust. Then I would compare those numbers to the most common "bigger name" cams for the years surrounding the build time. You might even call the builder, or post a message in the engine forums, asking what brand of cam that builder was partial to. That might help get you closer.