the 0320b3b is 160hp set up for a constant speed prop with an rear case for a prop gov,and vac pump and a -32 carb it was used on the pa23 don't know what issues you would have with the crank
I heard there was some limitation for the PA -12 (max of 160hp/ 2700 RPM for swing-out dynafocal mounts), so I thought it would be a good thing to double check for the -18…