I’ve installed both Tti( when they first came out for early a) and Doug’s. One with manual steering and one with power. Both are 66 valiants. The torsion bars are a ***** with TTIs unless they’ve improved them in the last 10 years. Had to use a clocked starter with TTIs. I have a Lakewood bellhousing and 5spd tremec with hydraulic clutch. Don’t remember having issues with z-bar.