Update: I've got the wiring almost wrapped up. I am so impressed with the wiring harness and associated documents that ERA provides. It really makes it nice when deviating from the norm - such as using electrical gauges instead of the stock mechanical ones.
Over the weekend I was surveying where to mount the MSD box and cap. Its funny how you seemingly have all the room in the world behind the dash until the dash is actually installed. I know many mount the box upside down under the glove box, but wanted to avoid that as the MSD manual specifically says not to. I ended up mounting it to the right side of the glove box, and I think that will work, but I wanted to check here to see if anyone had any more creative options.