I agree, that is an aftermarket optical ignition. Information is here: Crane XR700 You might want to contact them for details on the exact unit that you have as it's age is unknown and there could have been revisions over the years.I think you'll want to search for documentation on that aftermarket ignition system.
I recall from my 240Z that it needed spark plugs every 10K miles, without fail. New plugs should be one of the first things you do.
Also, your to-do list should include getting the correct hose for that make-do unit.