Outstanding build. I see a lot of love and a lot of dollar signs.
With your hydroboost you had a little issue with rod length (I did too), but did you at all change the location of the factory hole where the rod connects to the pedal? The reason I ask is because I didn't either, and although I haven't been able to try my brakes yet, a lot of conversion guides and posts suggested that hydroboost pedals mount a little differently than stock ones, and many ended up welding tabs and or drilling a new hole on their factory pedals for a ratio that is more suited for hydroboost.
Here's a thread where it's discussed:
http://67-72chevytrucks.com/vboard/s...d.php?t=658227
Also, did you just use a factory grommet between your HB and the firewall? Mine would not fit and I ended up doing something custom that I am not really happy with.