No, the motor is scrap. Trust me.
I'll do you a favour and give you the scrap aluminum spot price for it - so 90 pounds times 68 cents a pound - heck, I'll round it out to 75 bucks and even split the shipping costs for you to get it to me - I'm really just trying to help you out
Seriously, these were great motors that are hard to kill. Have a decent ignition system, power is good - many parts still available (only real downside is the old Tillotson carb that is tough to find some parts for), but in running condition may still have many years of service left in it.
Tell the perspective buyer that there is a BS premium for trying to snow you....