Camshaft identification help

I pulled the cam out of a 360 I bought from a friend. He thought it was one of the purple shaft grinds but couldn't remember which one. It has some yellow paint on it at the front end and then some purple paint behind that but only for the first four lobes. The number 987550 is stamped on the back end flat surface and has 3 different colored paint dabs next to the number. I have tried searching different cam companies with no luck. It was installed about 1999 so that is why he can't remember, but has only a few thousand miles and the cam and lifters are in excellent shape, so I would like to reuse it after the freshening up of the engine. Thanks for any help trying to figure it out.