Just wanted to bump this thread back up again...
just to recap; I've gathered that none of the stock manifolds or any available headers will clear power steering in a '71 Dart... that seems pretty clear now..
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When I first got my 68 cuda, the PS wasn't working. I filled the reservoir and drove it around CA. Within the very first day, the fluid that I put in leaked out. So I removed the belt and drove it that way for the next 3 yrs. When I finally completely rebuilt the front suspension, I removed the PS pump and extremely slimy heavy cast iron steering box and installed a lighter, more compact factory 16:1 manual box. I finished Friday morning the weekend of the Mopar Nats. I had an appointment to get it aligned and started driving there late morning. In all my excitement of trying to get the front suspension done and the top end of the engine reassembled, I completely forgot about the change-over from PS to 16:1 manual. A few miles down the road, I remembered, "Oh yeah, I have new steering." The change from the 16:1 unassisted PS to the manual 16:1 was completely transparent.
My whole point is, if you want to simulate how your car would drive with manual steering, just remove the PS belt and go for a spin. Keep in mind that the standard MS ratio was 24 or 26: 1. (slow but easy to turn) There is a MP 20:1 gear set available for slightly under $200 that will speed things up but increase the steering effort a little. The PS ratio was 16:1. The 16:1 manual box I put in is an original low mileage piece and there is virtually no slop at all. I also run manual disc brakes w/ a 1-1/32" bore.
And just to rub things in, I let my 105-110 lb 5'-2" FEMALE neighbor drive my car about 10 miles just last Saturday. I wish I had a camera to capture the big S*** Eating Grin she had on her face. She absolutely loved it and had no problem wheeling around.
I don't think anyone has mentioned Unisteer. They make bolt-in R&P coversions for Mopars. About 3-4 years ago, they were looking for an A-body mule car to develop a kit for. Since they are local to me, I seriously considered it but my 16:1 manual works so well, I saw no advantage. I know they DID have an a-body kit but for some reason, it's not on their web site.
http://www.unisteer.com/search_by_product/bolt_in_rack_pinions/mopar/b_body.html