I have been reading about the fast ez EFI Carbs fuel Injection. Kinda expensive, but is it the real deal. Does it really work well. I guess you have to change out the fuel pump and Carb and that is it. Anyone have this on their C3???

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As an owner of a crossfire system it is nice to have a fuel injections system even a faulty by todays standard system.  But the Fast EZ EFFI system is pricey.  I'm guessing you also saw where they offer Multi-port Kit also for another Chung of $$$.  For my money I would be looking at a multi-port system.   Not much of an engine guy but I had a corvette shop try to talk me into converting to a C4 multi-port system. 

I'm to old to put up with the issues that will cause i.e. no one would know how to work on it but me.

You may want to look at that idea.  I know that early C4 complete cars can be had for less than $2,000.  Just a thought.  May be some better Motor-Heads than me could chime in on what they would do if they wanted to go to fuel injection system.