The OEM autolites are excellent carbs, Holley is a very good performer but they typically require some tuning/adjustment, Edelbrock a decent carb for the unbox/bolt on & drive it, summit brand carbs- avoid like the plague- design is great mfg QA runs from good to crap because it is a chinese mfg.
IMHO, check with the local hot-rod guys for a local carb shop.....they can either rebuild yours, sell you a rebuilt carb (autolite, holley) and you will have a very good carb for less $ than buying outright new.