That EZ-EFI looks nice.
I was also looking at EFI for my BB but because of the $ I bought a new 830CFM annular, mechanical secondary Speed Demon (with all replaceable jets). Using the LMI A/F meter to properly tune it, it starts better than my modern daily driver. That LMI IS the tool that s required to setup a carb. Reading plugs and other old school methods are JUST that.