I think Injectorators are a good idea do not know why more people do not use them. That is where the problem lies, there is not many people who can give you a baseline. With that said they are basically a standard mechanical fuel injection with a set of squirter nozzles added.
Cheapest and best way to get it to work is dyno it with someone who knows how to tune injection. With out data it is just a guess.
If you think it is fat down low you can lengthen the turnbuckle on your barrel valve to lean it down some. You can probably put smaller nozzles and different plastic cam to cut the fuel down on your squirter system just like a carb?
If you have any high speed lean outs I would disable them until you got rest of mixture right then start adding HS a little at a time. Looks like you have several bypasses and I would find out exactly what each one does, what jet it has in them and where they open at. A leakdown tester can check them quickly and easily. I put a -6 an fitting on my leakdown tester and can check them at the track with my small El-Cheapo compressor.
Generally if I am not sure what it needs I try fattening it up first and see what it does. If it is fat it will not hurt much just slow down a little. If it is lean it could hurt the motor.
You can measure the turnbuckle with a set of calipers before you start making changes so you can return to your baseline if it does not work.
I got an Enderle hat last year, took me quite a while to get it where I wanted it and only took about 4 pulls to get it perfect on a dyno.
There is a guy who bought the rights to the Injectorators or selling them now, do not know exactly what the deal is but I can find him for you if you need me to. He may be able to get you a good starting point.
Nice looking car and good luck with the Injectorator, should work great when you get it dialed in.
