Is this old ball worth keeping?

[elitesystem]

Hearing of my renewed interest in bowling, my girlfriend's Dad gave me
his old ball, an Ebonite Don Carter Gyro that's been plugged and
redrilled at least once. I believe it's 15# or 16#, but I don't have a
scale to check it. Is this worth keeping, or should I consign it to
the house racks at the local center? maybe i should collect

[10pin]

I say take it for a couple spins and see how you like it. If the ball isn't helping you out any, add it to the house collection.