Missed your Aug 1 post until now, glad to hear that you resolved your ignition switch issues. Manifolds look good and hopefully hold up for you. I ended up getting Sanderson shorty headers for mine years ago, I'm pleased with them so far.
I've got the RTX gauges on the shelf for mine, definitely like the look of them. Are you or did you rewrire your car? If so did you use the ACC harness?
Guess you could say your halfway through the journey of the rebirth of your 70. It's looking great, with all the other components you've rebuilt while they had it you should have it together and driving in a couple of weeks. Enjoy you taking us along on the journey so far and keeping us updated.