So I've heard about the power pak commando set up. I don't think this is related. I think those blocks were just re-conditioned by American Motors in San Mateo as drop in replacements. I know nothing about motors. I will see if I can identify the pistons. Curious to see what size they are and if it's been bored? If the existing motor will run, I will take my time with that short block. I pulled the timing chain it was pretty loose, there's lots of sludge on the motor and valvtrain was covered in thick fuzzy sludge; about 80k on the motor. will check to see if valves are straight and seats decent. Learning as I go.