Possible to put a Engine in with transmission in a 67 Dodge Dart?

Sure. Basically, the rest of the engine bay needs to be empty; no radiator, a/c & ps out of the way. Headers may or may not need to be out, depending on who's you're using. Pull the distributor, there's a good chance you'll hit the firewall with it in. No ex. manifolds until it's in. A leveler on the cherry picker helps, but is not mandatory. Drop it into the bay tailshaft down, as the tailshaft nears the floor level it out and slide it the rest of the way back. Set the mounts down onto the saddles, put a floor jack under the tailshaft and level out the engine/trans. Bolt in your crossmember and you're done. Start hooking stuff up.
Guys will say to put it in from the bottom, but I'm assuming you still have all the suspension/steering still in the car.