Define the phrase "I want the most from my A14"
Most what? Driveability, economy, outright balls to the wall performance, allround flexibility, ..... what?

For balls to the wall performance, Webers combined with extensive engine mods, but overall driveability & economy will suffer.

For overall good performance, driveability, good economy & flexibility, you can't beat the original GX engines with their twin Hitachi's

Properly set up & tuned, twin SU's would be almost as good.

Well im no expert but i want the most from my a14 that has twin su's. Is it worth spending the money to fit a pair of side draft webbers. I have been quoted approx $1000 for second hand carbies recoed and manifold + linkages.