What kind of Gen III engine would you build around this Cam?

Normally, you don't build an engine based on a cam. You design the cam around the engine and how the engine is designed and will be used. For example, if this cam is designed for a blower engine and you don't intend to run a blower, it's not going to work well NA'd. A good deal on the cam may cost you a lot of dollars to make it work right in the engine. JMO on the matter...