Hey Judge!
I´m from Bogota- Colombia! Im working in my 79´MC and I started this project installing Megasquirt EFI for the base engine 200 CID 3.3 liter V6. Please see this link in youtube of my car working with Megasquirt Efi. Here in Colombia people use Megasquirt or Haltech. Holley can be a good option and I think is easier to run because it has autoprogramming.
Hope you enjoy!
Wow, you really put some work into that intake manifold. Megasquirt is open source which helps keep costs down. Nice job