The Articles section of FABO has a MOPAR options list Mopar Option Codes. It lists 69 to 71 codes but most of them are probably good for 72. This site has factory service manuals that will help you decode your vin Service Manuals – MyMopar. It doesn't have the 72 Dodge manual but it does have the 72 Plymouth manual which has much of the same information. It won't tell you that the "L" in the vin is for Dart. The "301" means your car was built on March 1st.