Help! '64 170- '66 170

So I picked up a ratty '64 Dart170 2dr with a 170ci slant and a three speed on the column. The add said doesnt run, the add was wrong. It runs, on most of its cylinders. It has cracked/blown rings on cylinder 3. It puffs smoke like a train out of the valve cover! This hasnt stopped me from driving, killing all my chances of being liked by my neighbors!

Anyways, picked up a 75k mile 170ci slanty outve a '66 Valiant on the cheap to replace my original engine. I replaced the consumables, water pump, timing chain, etc., and all gaskets except the head gasket. I intend on doing a head job later.

So the question is regarding my replacements engine originally being backed by an auto trans vs the 3spd manual Im putting it in front of now. Is there anything other than the obvious thats different?