I agree , I am not a fan of 4 link suspension , yes you have more spring rates available but the gain is very minimal for a lot of work , I would use a B body diff , move the springs inboard & use composite springs & good quality double adjustable shocks , you will have great ride & handling if you want more you can notch the frame rails & move the front of the spring inside the frame rail at the front & build a box for the rear but to use that space you also need to tub the wheel wells . Mopar suspension was decades ahead in the 60s , no need to rethink it just put in better parts , Richard Ehrenberg made a Valiant corner above 1g with simple upgrades .
I have helped build a number of cars & everyone who has installed 4 link has ultimately regretted it,, just not enough gain for the work or cost involved .