How do you plan to address X bracing between the frame rails? Most of the newer chassis is designed for the drive shaft to run on top of the bracing and build a tunnel around it..Looks like this presents a problem in these older cars, were this bracing will be right were the drive shaft will be. By putting the driveshaft below the bracing puts the bracing way up in the floor boards..

Im still undecided on how to do this...but I have a few idea's.

Hey Curtis
Do you have the spec sheet for material size etc? I have these drawings, and spec sheets that cover size and wall thickness...PM me if you need them..I will get then out to you in your included email..

Later
Bob