Tjay, dude a stock 300 in the same county as a an Atlas?
However a 300 with 32 spline outputs, 4:1 kits....an atlas looks much more affordable.

Why does it always have to be how cheap you can build something?
Why not start with the best way and work down to what you can afford. This way you don't miss out on a better part or method in favor of bubblegum and bailing wire BS of installing one wrecking yard part after another until you have exceeded the cost of having done it right in the first place...?

SD

PS Clocking a t case is critical if you intend to have a better break over angle, if you want to have a flat skid, if you want to chuck the oe skid plate garbage...