There are many "self tuning" EFI's on the market like Holley and Edelbrock, etc. You could even use your original fuel injectors but there are many easily available, high impedance fuel injectors that will fit in the D-jet heads. Just don't buy the China knock-offs. Some early Mustang injectors will fit if you change the pintle caps. You would need to fabricate fuel rails. You might as well go to a distributor less ignition while you are at it.

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Tony H
W111 280SE 3.5 Coupe
Manual transmission

Past cars:
Porsche 914 2.0
'64 Jaguar XKE Roadster
'57 Oval Window VW
'71 Toyota Hilux Pickup Truck-Dad bought new
'73 Toyota Celica GT