78GMC Project for Life

[BOOMERSOONERS]

I'm pretty new here, but i've been doing my homework over the last year and decided on this 78 gmc shortwide as a project. Now from the crazy rides you all have done, which all are in a league of the own i decided on a Mcgaughys 4.5/6 for mine, which consisted of 2 1/2 spindles and 2inch springs and flip kit and cnotch out back with belltech drop shocks all around. Now i have the front finished and have moved to the rear. My only issue back here so far is that PO removed some leafs or maybe not. I dont know. I have 2 long leafs and then a short one on the bottom. I ve been looking like crazy. I understand that there was a 52 inch and a 56 but my question is how many leafs should i use on mine? Any help would be appreciated and pictures will be coming shortly. Thanks for any help.