So, I'm working on a 69 El Camino for someone. The issue is the small dia dual-diaphram booster and Corvette style MC sticks out and up too far from the firewall and won't clear the bottom of the hood. GM Master, Booster, and Brackets. Anybody out there either had this problem, or have this in their car that could post a couple of pics for comparison? I've posted about this on other sights with no response. Thanks.

You would have better luck posting this on the sister site, Team Chevelle.
My guess is that you have the wrong brackets on the booster making it all sit at to much of an angle.