MuuMuu101's 68 Dart, A Learning Process...

If the distributor is loose timing will jump around. Try and turn cap with hand see if it moves. Does the carburetor spray fuel when you actuate the throttle blade? These things can be tried without even running engine. The timing chain can also jump time but it’s probably not the case here. The engine really only needs three things to run, air, spark, and fuel. Check these areas.