Carburetor, MSD, Holley Sniper EFI questions

A lot to unpack there. I appreciate the info that you took the time to post. The concurrent running threads is by design. I know from previous experience that sometimes very knowledgeable people only check certain parts of forums. Instead of running one project thread, I have found the shotgun method is the best approach. I will figure out the carb on the way to EFI. I have a white board going and a couple hundred pages of install instructions that have digging into since I purchased the car. Goals were set before the car got delivered. The radio was done properly. No worries there. The suspension is almost done. Thats more about time at this point, but it should be done this week. I'll get to my end goal, it just takes time.