I used them with my 5.0 setup. my 2" drop spindles made them real low. My collector flange had a bolt at bottom of the flange that hit everything. I cut the flange off and rotated it off the bottom side. still lower than I liked.
I have a set, not in the car. Measured them and I am very confident if installed I would flatten them the first time I leave my driveway.
I had a set on a 72 Comet GT 302 a few years ago. They would scrape on practically any thing I ran over. Sold them and went back to stock manifolds. The 72 comet I have now has stock manifolds.
Years ago I ran hooker headers on my 302 I believe were part number 6910, they fit column shift and power steering. You had to use the longer slave cylinder bracket to clear steering ram but they fit perfect. But I don't think they make them anymore?