I think this post is a great idea and can be really informative.  Figured I would add a couple pictures to help keep it going. I got these Kustom brand headers years ago from the a member on the 428Cobrajet forum and they have been sitting on a shelf for a while. I was told they don't interfere with the clutch linkage on 69-70 CJ Mustangs.  I still plan to use them some day,  so we shall see.

Those are a Headman header. I had those on my 66 Cyclone GT. No problem with the clutch linkage.

https://youtu.be/xHPXikbOork

https://www.roadandtrack.com/news/a36156328/nascar-legend-leonard-wood-made-a-12-scale-ford-427-by-hand/?utm_source=facebook&utm_medium=news_tab&utm_content=algorithm&fbclid=IwAR2S1uDoGpw4SwcEKmA29cSlMriI69xxfxQ7C3ky0GSpnhxfWDO8vZz_S7g

I think something like the Edelbrock ProPorts but with TP port spacing would be a good idea. I also think that there is a market for matching intake manifolds.

People with only bumper jacks tended not to have welders to put those tabs on.

I think they listed the three step #6374 headers for a couple years, 1 7/8", 2" and 2 1/8" tube steps. But i wonder if they ever made any? I've never seen a set and when i tried to get some they were not available.

I saw a set on a C/SA car at Seattle several years ago but I don't remember who's.