They used the C/R with the removable tops and had the wiring harness hidden inside the plenum, very sanitary installation.

Use dual throttle bodies and then you don't need to worry about the plumbing and wiring. FAST makes a good dual throttle body system or you could use dual Holley Terminators. Call Rich at FAST Man EFI and he'll tell you what the best way to put EFI on a cross ram is.

I have done this several different ways. From running two TBI throttle bodies to port injection with everything hidden inside. I'm not a fan of the results running dual TBI throttle bodies. Harder to tune, and too high in some cases. The port injection systems worked well. My first approach was using fuel rails but later I used individual -3AN lines for each injector. This was easier to fabricate and worked very well because it consumed less space.

I have done this several different ways. From running two TBI throttle bodies to port injection with everything hidden inside. I'm not a fan of the results running dual TBI throttle bodies. Harder to tune, and too high in some cases. The port injection systems worked well. My first approach was using fuel rails but later I used individual -3AN lines for each injector. This was easier to fabricate and worked very well because it consumed less space.

I did dyno this engine and it did well, but I have no before and after numbers. Obviously, this was a street/show car so all that was needed was good driveability and it had that in spades.

A cross ram is the wrong intake to choose if the customer wants the engine to fire up easily and drive nicely. If the customer is willing to spend a bunch of money for an EFI conversion then it could be made to work. Not sure what the bill for a conversion like that is going to be, probably several thousand dollars.