Finally found a solution. Couldn't get a timing tab, but found something better here in NZ - a factory timing cover with marks on the side I need!
Will be installing soon.
Hi All,
I have a '56 Desoto Diplomat that has been repowered with an Australian origin 1972 318 V8 (LA motor) from an Aussie VH Valiant.
This particular engine has a bolt on timing tab on the left side of the motor (looking at the front of the engine). The tab is missing.
The water pump hose...