Doug's headers fittment

I have them in my Duster with a 340. 833 4-speed with mechanical linkage, flaming river manual steering box, mini-starter, milodon road race pan, and stock V8 spool mounts with polyurethane inserts. I had to modify the z-bar (same as the TTI modification), and both sides needed some dimples to fully clear the 1.12" torsion bars I have. I also trimmed the corners on my 4 speed bellhousing, which is also mentioned in the install instructions if I remember right. I had to trim that back even more for the TTI shorties.

What exact mod do you need to do to the Z bar, first i heard of this??

Thanks Jeff