I put a 5 Alpine (Gordini) engine in my Renault 4 with the 1108cc box and completed 10,000 trouble free miles before rot ate the body. It was about as quick as a Toyota Celica Turbo my friend has at the time.
I then fitted the engine and box to a Renault 4 van and then drove all over Europe with no issues. Good ratios.
Don't forget you cant use the 850cc box as you will have 4 reverse gears and one forward (good for hard shoulder motorway pursuits maybe).
Action Photos including me standing in front of Renault 4 Van, Renault 4 van getting towed off motorway in rain by mad German recovery driver at 80 mph on 6 ft rope and Renault 4 being fixed at German Renault dealership (the mechanics loved it). The points had failed. Van parked in street in Prague Circa 1991.