I see that the Accel 300+ setup had two different types listed:

one for 93-95 with a coil and one for 96-97 without a coil.

I'm converting to a vented opti in my 93, and need to know if that affects which system I need to order. What are the differences, and which do I need?

 

The differences are in the harnesses used that go between the coil and the box.

If you're keeping the stock-type coil and wiring, then you should stick with the '93-'95 version.