Car rebuild kits are easy to do. you just have to takwe your time and remember that your idle screw, remember where it was at, before you replace with new one.
and don't turn them all the way in tight, easy to over tighten them and damage the tip / end on the idel screw and air screw.
But overall easy to do.
Why not fix the one you got, rebuild kit and get a new float too.
Any carb that has not been in use for awhile, needs cleaned and perhaps new gaskets.
Sporty