XL500 Carb question

[jake28]

I'm in the question for a new carb and am looking for recommendations. I have a project street tracker with an Ascot FT500 motor (basically an XL500 motor). The head has been ported, it has a high comp piston, a pretty free flowing exhaust and race headers, and a K&N. Currently the bike runs fine except that the the throttle sticks sometimes. I have checked and rechecked and the throttle cables are all free and not binding. After visually inspecting the carb, it appears that after so many years of vibrating, the carb throat has been ovaled and scored enough that the carb slide catches occasionally on decel, requiring a few blips to free it.

What carb would you reccomend for an old big single that has been massaged?