FutrA&P, As I recall from years ago... wasn't the TC for that series of engines sold to the Poles? PZL or something like that. Maybe if you wander thru the FAA RGL you can find details of the Franklin series. Great engines, very smooth but rather short life after overhaul. I used to fly behind one in a Stinson 150. Try a Google or Trade-A-Plane search, also in TAP there's an outfit called ESSCO that sells vintage manual reprints like that, good luck.
JQC-DER/DAR