There are a lot of guys running hellacious engines that they know every part that went in, etc. Does not mean they built it, though.
Rat, I would wonder why you don't simply start by comparing the base circle to the max lobe sizes of the intake and exhaust to get lift figures to work with. If you got a figure in the low to mid 0.4" range, you'd know it was a mild- possibly stock- cam.
If it's still in a short block you could whip out your degree wheel and pointer, dial indicator and piston stop and plot the cam duration-to-lift and use those figures to find the exact grind.
But I will say those numbers do not look like a performance cam's ID markings- they look like an OEM cam ID to me.