Tune the carb you got.
A vacuum secondary carb will need just as much tunng.
EFI will need $$$more$$$$.
Get yourself a AFR meter/gauge, manifold vacuum gauge some numbered pin drill bits , a soldering gun and electronics solder (to create and dial in the jets sizes etc). Start by correcting the idle and off idle circuit transition (idle air bleeds idle feed restriction) and then work on the accelerator pump circuits. Correct the ignition timing curve.
These are the areas that need work to sharpen up the throttle response.
even a simple cheap narrow band AFR gauge/(heated) 02 sensor will show you 99% of what you need.