But I loved the concept, The French Connection II I thought was worth a watch. Not as great as the first but again great concept and Gene Hackman in the 70's was always great.
I also recommend Mean Streets McCabe & Ms. Miller (Godfather was on your list so I figure other period pieces were cool) Thief (Came out 1981 but has a more 70's feel to it) Gambling City (Italian) Rabid Dogs (Italian)