6) he could fix it, and he might just do that. it'll cost about $2000 to rebuild the head properly with machine work, new studs and hardware, light porting, valves and seats, and possibly some bottom end work if the piston/sleeve/connecting rod & bearing didn't survive. Or $800 to do it ghetto and just get it limping.
84k mile engine with warranty. Shipped. $1350.
That's how I'm fixing it.
I'm sure you'll find someone else to take you up on your generous offer.
If any moderators see this thread, go ahead and close it. The car is no longer for sale under these conditions.