76 dart 225

So here is the motor from the 78 b100. Peanut head. The dart has drool tubes. Which should I use. This motor turns over, currently bolted to a 904. Turns slow so the starter is bad I presume. Can I take use the one currently in the dart hooked to a 833 of so I can see if it will actually start the van? If it runs and better than the darts 225 I wanna start pulling the motors so I can do a complete rebuild on the darts motor. I'll be using the super six regardless. What else should be used between these two motors. Are the cams different?

IMG_20170515_095916-600x800.jpg