FORGED CRANK........HOW MUCH SHOULD I PAY

Hi Folks

No, this won't turn into a for sale thread. A local family member has a 1970 340 forged steel crank in nice clean condition (std rods and .010 mains from the factory) but will need a trip to the machine shop for grinding prior to installation. I'm not looking to steal it, I just want a fair deal for both of us.

How much should I pay?

Thanks FABO