Yes, a good spot to put the MSD box is above the heater box on the firewall. Some people also install them on the wheel well.
You should PM andrewB70 about the Hydro-booster. From my perspective I love it. Street driven - it really helps deal with the low RPM's vacuum issues.
Andrew is a knowledgeable person on all mechanical issues. He should be able to steer you in the right direction.
Keep up the good work.
Who are you checking in on a for replacement door? I don't remember my sources off hand, but can look them up if needed.