8-3/4" Purchase Questions

I would like opinions on my best option. I'm going to upgrade my rear end on my A body since I'm installing a big block.

I currently have a correct A body length 8-3/4" housing, no carrier or axles. The perches were cut off previously.

Option #1:
Buy carrier, axels and reweld the perches back on the housing I already have.

Option #2:
I found a 741 A body 8-3/4" non sure grip for $250 on a Duster. It has the SBP. The only advantages that I see here is that the perches are already welded on and I don't need to shorten it. I don't know the year since I believe this owner added it to this car.

Option #3:
I found a 742 8-3/4" non sure grip for $250 on a 67 New Yorker. This one has BBP axels.

I want to get posi so I'm going to have to address that for all of the options and I'm probably going to need new gears since I'm going to have to match with the rest of my new drivetrain. I'm thinking I should go with Option #1. What are your thoughts?