Is the 450se and the 450slc engine the same for the 1973 model year. Could you purchase parts for a 450slc and use them in the 450se. THanks also on the dashboard there a few lights is the third one from the left the seatbelt light if not what is it.

 

The 4.5 is basically the same engine from first production in 72 through 75. In 76 the engine went from EFI to CIS fuel system. Exhaust manifold and engine mountings differ, but the basic engine is the same. Can't help you with the light. Haven't been in a 116 in years.