Forget that it is JDM. It is a B16, same parts from a 99-2000 Si and a Del Sol VTEC. I've seen new distributors on ebay go for $200 or less. A parts store near me has them for $175 just call around your parts stores. The 96-97 Del Sol DOHC VTEC and 99-2000 Civic Si are OBD2 the 95 Del Sol is OBD1. As I understand the 96-99 Civics the ECU connects to the same harness as the engine, it's not two seperate harnesses like the 92-95. You could rewire the entire car with a set of harnesses from a 92-95, but it's probably not worth it. You'll want to find a stock harness and modify it to run your B16. THe EX harness has all the plugs, some just may need to be moved or extended. I have a set of OBD2 injectors I'll sell you if you deciede to change the engine over to OBD2, then get the distributor and a ECU, Hondata has a P28 that will hook up to your OBD2 harness, so you wouldn't have to get a OBD conversion harness. What ECU do you have right now for the B16?
As for finding a stock harness you can post wanted ads all over the net, call some of the Honda specialty yards that sell swaps and keep an eye on your local yards. I think there is one around here, was last time I was checking the yards, I can check on for you if you want.