64 Viper Dart??

Sounds cool, but would probably be very costly and labor intensive to do it right...and I'm not trying to talk you out of it at all if you have the time and means.
A few things that come to mind are what will be the purpose of this car: a fun driver, a show car, straight line car?
For a fun driver I would go with a small block (least expensive and minimal fabrication & modifications to do correctly). Basically bolt ons.
A show car is obviously very expensive and labor intensive to do correctly, but if you have the money and time, GO FOR IT!! Post pic's.:thumblef:
Probably not the easiest choice for a drag car.
I don't think there's a way to get enough rubber on the ground to get the amount of handling you would need for cornering at high speed (ie. like a Viper) without major mods.
Regardless, if you have the means and it is what you want, DO IT. It would be pretty unique. The people hear are pretty knowledgeable and will help answer questions the best that they can. Either way, Good luck and get 'er back on the road.:burnout: