Am i crazy or am i on to something here?

There was a running 67 273 2 brl. for sale here. Much closer to correct for your 66. Pretty much drop it in a go... to the bank maybe. Do you need a lot of hotrod/adapting to drive in todays traffic? Or should I say the traffic of a couple years in the future?
A lot of 340 blocks have been punched to .030 over already. A good 68 340 can bring good coin from the right buyer.