Fusible link or not?

Very nice looking unit.
But I don't think this initial or trial setup will work. The battery will drain.
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Not sure what you're trying to accomplish in phase 1. I f its just to see if the Denso works, I'd skip the fuseblock and attach the Sense and Field(switch) wires to the Ignition feeds (J2 & J2B). J2A still feeds your existing ignition. If the engine doesn't shut off when the key is turned off, then the issue is the one I mentioned earlier. I just don't know about that.
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If phase 2 is EFI, then need to figure out how they will be turned on and off. Also the electric draw of the EFI unit and the fuel pumps. If there will be one relay from the key switch, then that relay will have to be capable of continuously carrying a relatively high current. If its a relay after each fuse, that's easier for me to understand.