Who is going to install it? If it's a chassis shop, what's theur preference? Lots of fabrication involved - installing the front crossmember, installing a new shock crossmember, etc. And are there plans to tub or narrow the car? If so then I'd be installing a 4 link then, not before, cause you'd have to re-do a lot of the work when narrowing the car. Then there is the intended use - street duty, drag only, etc. Makes a difference when selecting the heim joints - arguably as big an expense as the rest of the 4 link parts. Good chrome moly joints can cost more the the 4 link tubes and brackets. Street cars can get ones with nylon inserts for a less harsh ride.
I used a Chassis Engineering kit on one, but I also tubbed and narrowed/backhalved the car at the same time.