Ohhh, I thought you were going to run a dry sump and looking for a place to mount the tank and run the lines. I was torn about the coils too. Originally I was just going to run the black valve covers from Holley where they are mounted on an angle and exposed. I thought about mounting them somewhere hidden, but never really found a clear solution that I liked. I didn't want to deal with extending the wiring for them and longer plug wires. In the end I decided to go with the 2 piece covers from Holley that hide the coils and the wiring. Got them in black with the Chevrolet script on them.
https://i.hmjimg.com/images/2020/03/...1DD4754321.jpg
I'm going to run manual brakes for cleanliness, so can't help you there.
AC lines will run out over the passenger fender through the firewall using the pass through fitting from John at II Much. No bulkhead fittings, less fittings and less chances of a leak.
Exhaust, I'm leaning towards the headers from DSE, I'm running their subframe. I know Holley makes headers that fit too, but damn those DSE ones are nice. I'll have a shop do from the collector back.