I recently saw a fresh 427 aluminum block in a 64 Fairlane. The block came from Carrol Shelby and was only $5000.00 bare. Then the bolt kit was another $500.00. I'm guessing this engine out the door was close to 20K. But it sure looked nice.
If you're talking about Genises and thinking about buying one, be careful. They have been taking $1000 deposits for over a year and no one has seen a block. $2999 for a cast iron block and $3999 for an aluminum one. They have well over a thousand orders.