First of all, Nachman.. Slick looking engine! Whats the secondary unit under the alternator.. Looks like a mini ac compressor/dry sump/power steering pump?.. Curious what that is.
Jumpjet; If your looking for a install and tune kit, i unfortunately don't have any suggestions.
However if your looking to design and assemble your own efi kit (minus electronics). I have some experience with the Megasquirt and microsquirt ECU systems. I am going to do a microsquirt kit on my 2nd engine build (big bore turbo), and they are a great little cost effective system to plan with when doing a efi conversion.
Nowadays, efi can be pretty much "order and bolt on" with a few custom "parts" depending on how you want to do it.
That throttle body hobbler mentioned is a very cool pc of kit. I was a vw bug nut when i was younger, and although efi conversions were kinda rare due to the limited availability of standalone efi ECU's. The weber DCOE "style" carbs were very popular in the air cooled bug world. With a large classic vw community and their demand for "customization goodies" i was able to recently find a DCOE style efi throttle body. It has a mini fuel rail, throttle position sensor, and accepts std bosch injectors (cant remember what version off the top of my head).
Again fitting something like this to a small stroke engine wouldn't be the best solution. But there are ways depending on how many grey hairs you want. You could in theory, cut the efi DCOE in half, and only use one throttle body with the fancy injector setup.
On/Off For the past 4 years i have been building a classic MB supercharged V8 with a full efi and i am using the megasquirt pro ECU for it. I hope to have it atleast start this year. Currently converting all the drive accessories to a modern serptintine belts have been a chore. But i want to see it atleast run on the test bench. Its definitely been no small feat. Ive attached 2 old mockup photos as i was doing layout.