HELP! with Crankshaft ID

I have just bought a crankshaft from a guy locally and apparently it is a stroker crank for a 318 - 340 although i am still trying to find info on it. The only numbers I can read from the label are 68875 and a partial P4529 something...something. I am waiting for my seller to get back to me but i thought that I would try the GURU's on this awesome forum as well.

THANK YOU!

Bobby