No, the TR7 schematic can't be converted directly to a PC board, but with it and what we know enough about L-Jetronic Fuel Injection theory we can fill in for any "little black boxes" Considering the simplicity of L-Jetronic fuel injection, it doesn't take a lot of engineering to duplicate things, using some digital components, what was done using the more complicated analog stuff. Take the FM radio receivers you get at the Dollar store- in that little plastic box, you get a FM radio receiver, digital frequency display and audio amplifier, plus a few buttons to control the tiny, simple microprocessor inside. Substituting a few modern parts, like an MAF sensor, oxygen sensor, or AFM for the deprecated stuff we now use, would probably improve the control and make the system more reliable, with spare parts available for another 30 or 40 years. A 280Z ECU doesn't have to be "programmable" as we are accustomed to the few adjustments that are available, but there is room for a few adjustments.