The nature of a four link install almost makes a full on tub job make more sense.
It could certainly be done , but to get optimum length bars and angles I think the back seat is a goner.......and as long as you are in that deep , why not stuff some meat back there.
I am wrestling with that decision for my A body and the least painful would be ladder bars.
I will exhaust a bit more effort on the leafs , but getting them to hook consistently is looking like a problem.
If I do go four link , I will also go big tire.