torsion bar and ps box upgrade

with my tax return im planning to do some upgrading to the 75 duster i have...

4.10s in the 8.25
upgraded ps box (steering coupler from flaming river?)
torsion bars
ss springs
uca/lca bushings
id like to find a rearend bearing kit for the gear installation

so what is hot on the market now? i looked at a borgeson for the ps box, pst 1.01 for torsion bars, think i found some mopar performance ss springs on local CL, offset bushings or stay with normal bushings, and i havent found anything on a bearing kit for the rear end. any suggestions on a ring n pinion? i also have an open read end housing and i would like it to be locked.

please guys send me in some good directions for these upgrades, cant wait for responses and ordering!! oh and of course the installation