340 Build Spec's

As of 11/23/05 we lost the 340 that we were suppose to get! Now we have a couple of choices left that I am not sure which would be the best.
We have a 73 Challenger sitting in the back yard that was either going to a new home as a complete car or we could pull the 318 and tranny out of it for the Dart. I know its not the 340 that I really wanted for the car but the only cost in the motor and tranny would be the rebuild. We could look around and put a 360 in it but what do you really gain execpt cubic inches. If this car was going to see a lot of time at the strip then that might be something to consider. But this car is going to be a daily driver and may see the strip a couple of times...
What do you think????

Thanks
Rick