HM Ambassador Car is based on once common car in 1930s,40s called "Morris Oxford".isuzu,matador,jaya diesel engines came lately(from end 1970s).
But ,the earlier Ambassadors called "Landmaster" is a collection piece.So is cars till Mark-III(1978) .Ambassadors came in Mark-I,II,III ,IV during its golden years.My Relative Once Said ,During Closed Economy License Raj era ,People Goes to Calcutta(Kolkata) to Buy Amby.Such was the demand.Amby's Complete Body Shells were locally manufactured and I remember one such ad in Readers digest magazines of 1970s.every spares were very cheap.The Rear Seats are Very Comfortable.
http://www.hmambassador.com/showroom.asp
Landmaster And Ambassador Picture Gallery - Team-BHP