440 or built 360 71 demon

It sounds like you are realistic OP...... If you take a healthy small block and dupe a big block in the same fashion the motor with the Front Distributor will make more power. What you do with that power and how you make it all work is a whole different story.....

I would have to be willing to make safety updates to a car if I did a Big Block as I would be looking for something low 11 or 10's. A small block would probably be my preference at this point in a street car and if I want to put down some strong numbers at the track I would make sure my setup included the ability for a good size NOS hit. But to each his own.....

JW