As John advised a 1.2 is too high, ie would over gear it to a point of driving a 4 speed.
A 1.4 is a stretch unless you add a header and less fidley carb.
The 34 with all the contraptions added for fuel anti-run-on and gasoline fume reduction and forced timing changes makes it problematic from the show room, much less 29 years later.
A weber 32/36 will work without issue.
The best option for you is to get your shift linkage working.
Also make sure the diff lock indicator switch is not out of adjustment which can cause some issues if you are going into certain gears if not all of them.
Uncle "Richard" Douglas has a Land Rover with big wheels that never gets stuck... until he breaks something so it won't go. Uncle Douglas always breaks something. - Anna Crowther at the Conclave 2012 (AKA Carburetor Neck)