When I install this, do I hook the + and - coil wire up directly to the coil, and leave the round plug unhooked, or do I install the + and - coil wire up to the + and - coil and leave the round plug hooked up? This is on a stock distributor setup stock coil and all.

 

Go the msdignition.com for a good diagram.
but you put the + and - to the coil, Then the round one connects to the other wires