Those carbs are very common. I had a 62 Econoline van with a 200ci six. The 144ci 170ci and 200ci engines used the same engine parts and are fully interchangeable. Many years will work also for those engines. The rebuilt carbs are ok, but one in ten are actually good. It would be best to rebuild your own since they are very simple.
Or I suggest having to install a C4 auto tranny and 5.0 V-8 engine. They have very easy kits with all mounts for it and then you can upgrade to 5 lug suspension with disc brakes pretty cheap.
You have alot of options as the 64 1/2 Stang has a huge following.