Rear end question

[Raked 64]

Looks like the rear end of my 64 has been changed at some point. I noticed that there is a different style bar mount along with the 64 mount that was welded on to the the rear end.

I am planning a 5 lug swap and I need to figure out if I have to reference a different year rear end when I order parts.

It is a 4:11 posi unit.

Any Help would be appreciated.

I plan to order axles.

Truck has been sitting for 18 years.

Moser axles the way to go?

Would you get into the rear end and check anything?

Obviously I may need to pull axles an verify length and splines?