1950 Crown stove to convert to LP

Hello, I was gifted a lovely old gas range with character! But don't know how to switch her to propane. I think she's equipped for both LP & NG, each burner has two distinctly different orifices, one for LP, one for NG? And I don't know yet about the oven. Thank you for ANY help!

The oven burner orifice is interesting, looks newer than the rest of the stove. Under the broiler pan I found a stamped metal plate and another plate with nothing on it at all. The stamping of the plate makes me suspect this stove was converted to propane at some point, maybe why oven orifice looks so much younger? And the stove burners are seemingly equipped for both? Again, thank you for ANY input on this!