Mine is a '78 4 door 1.2l.
I bought an adapter for a mitsubishi SU type single-carb from a Proton Wira (Malaysian evo 3 knockoff).
With a 4-1 performance extractor and a 5zigen cannon from...i dunno what :p, i get great acceleration and power (highway at full throttle 140kph, scary shit). I dont embarrass myself in autocross either :)
Cost was 600 ringgit for the carb and adaptor, 800 for the extractor and new exhaust piping from a shop. 1400 ringgit or +- 300 USD.