Should I ladder bar or 4 link

Did you ever mention what you have for shocks? I'm old. Can you repost that if you have already?

I'm glad you are leaning towards the 4 link. Spend your time understanding chassis and the 4 link will come easy. Just never start out with an instant center that is half the wheel base a cam high. It's too short and too high for most everything.
So say i just got my car back with a new 4 link installed. Know nothing about setting the bars except a little about finding instant center. Were would be the best center and height to start out with?

EDIT: lets say it the OP Duster.