General question, presently 74 nova factory rear but want Eaton posi & 30 spline rear. I know i need Moser a103002, upgrade kit + seals but here I get conflicted. Which Eaton posi and gear set is most cost effective & works best with a 10 bolt 8.5 inch housing? I have been told to be careful about truck vs car kits pre 88 as they differ plus I have the specs you used on a job for super Chevy from years back that mentions a 5tt481 with 3.73 gears 10B85373M that seemed to go well together. When all things are factored together it comes out being very $$$ but I'm your average guy with not much $ who doesn't need $$$ rear but simply those specs at affordable pricing. Simply put how do I get those parts/functions into my hands so I can put them in myself without breaking the bank?