Yup. You are correct. Will have to dimple the headers somewhat. But it's worth it for getting fast ratio...
If they only made a rack and pinion kit for the A body. (Unisteer on my 69 Mustang is excellent!)
Yeah I tried the TTI shorties on my Duster, there really isn’t much clearance at that head pipe.
They used to make a Unisteer rack for the Mopars but the resulting steering geometry was terrible, I believe it was discontinued because of that.
A-bodies really aren’t good candidates for the fast ratio steering arms. You’d be better off with a Borgeson power steering box (14:1) to lower the ratio vs factory (16:1). The other option would be a steering quickener, although that would require modifying the steering column. The Hotchkis Challenger used a steering quickener for a final ratio of 12:1, same as the fast ratio arms.