In a conversation with a Smart car owner in Dayton Ohio, with a pristine condition 451, he mentioned he had thought about replacing it but concluded that he could not think of anything that could replace it. I thought of what I would replace my own with. For my current situation (street parking in NYC) there is nothing that could replace it. If I moved where parking would not be the issue I am still not able to mentally replace it. ..... So here are my new Smart car needs and they are again in that small criteria window so it will be hard to screw this up. I need what use to be refered to as a "built, balanced and blueprinted" 451 engine as well as a "bulletproof" 451 gear box. This is a period end of story situation. The cost is what ever cost the builder of each item will dictate. Of course it would have to be with in my means to pay for as money is a object, but that negotiation is the nature of commerce. Take into account that a replacement car used 5,000 dollars, new 30,000 is a clear indication of the affordable range the engine and gearbox could cost and still be financially feasible. So that is now written in "stone" (the undeletable cyber cloud) It's what I want on purpose, on my prayer list and a goal to see through. Thanks my Dayton Friend.