Ignition coils, probably alfa (new ones) or one if the breakers on here (used).
Spark plugs, depends, I buy as much of my parts from alfaworkshop as possible, their service is excellent and you can choose OEM parts. On the twinspark, use NGK plugs, but worth checking for your JTS what's the recommended ones.
You change them yourself if you have a basic socket set, with star or torx or Allen bits, and a spark plug socket.
The wheels should fit, I don't think that there'd be any difference in the hubs, and shouldn't have any clearance issues.
Not sure if there's any other differences on the blackline apart from trim, but someone here will know