help please

[awesometool]

I would be greatfully for any help on this because I have no experiance with coil over or fatman subframe. I currently have moser 4.11 rear end, sport bear brake kit, hotkis suspension system, stange shocks, new stock upper and lower control arms, stock subframe and caltracs. It is going to chop shop custums monday and he is replacing quarters, trunk pan, tail pan and install DSE mini tub kit. I told him to tell me as we go if he had any good ideas let me know so he mentioned fat man for front and complete coilover 9" ford rear end kit that bolts on and lets a wider tire fit to handle 650Lbs. I do trust him but will this make a huge difference compaired to what I already bought? I have right about 47k spent already and if it is not a major difference then I will not have to break open my penny jar "its getting tight". I know the control arms must go but when I bought those I was on the keep it stock but that changed once I saw the 572bb.