[Walt Fricke]

I was going to mention the 73.5, but hesitated because my knowledge of its quirks pales compared with Jim's. So I don't know if there would be any advantage to it as an intake system. Aren't the injectors actually in the heads, or in collars which are inserted into the heads, and not in the manifolds? That would make them bad candidates.

Another option would be to purchase manifolds and EFI throttle bodies. I think you are into ~$2,000 for that hardware even before you buy injectors and make up an ECU. So there would be cost tradeoffs all up and down the line here.

If I remember correctly, I think you can buy injectors to use with Holley 4 barrel carbs, but I've not heard of any way to do such a thing with Webers.

So this sounds like a paper project to delight a first year engineering professor making up a project question: how to get value for your results, since it seems you can't just plop the CIS manifold onto the existing heads.

Rough guess - maybe you could pick up a decent 3.0 for less than the cost of any of the hypothesized conversions? Need a different fuel pump, and a fuel return line, and some other stuff, but otherwise pretty much a plug-in.