Ok yes Im new and have a lot of questions that I have posted but I want the car done right.

I have a 10 bolt open diff(peg leg) with 322s in it now. I want to get a new 12 bolt posi.(new or used dont matter) Im not sure what gears to put into it. I have been told by one guy(who im having trust issues with) with telling me put 390s 410s or 456s in it(car is NOT tubbed). Originally I wanted 373s in it. My friends dad tells me either 322s, 355s, or 373s highest. So before I spend the money I would like to know what to get

The car will have the regular sized tires, and its only driven localy really, due to insurance reasons. If its going far away then I trailer it.