carb needed

hello to everyone
i am new here and new to mopars.
i have a 1965 valiant convertable with a 170 slant 6 w/auto trans.
i am having trouble with the carb being worn out. i have read that the 225 single barrell is a good upgrade.
where can i get one. does anyone make a new 1 barrell carb that would fit. i cannot seem to find anything.
i recently put a kit in it but it really seems worn out.
thanks for your help in advance.
:bounce: