If you want to stay ECU free and stock looking go with the original Pertronix.
The only difference is that there is 2 wires coming out of the dist cap instead of 1.
Hook the Red wire to the + side of the coil and the Black wire to the - side of the coil and your done.
Everything else stays stock.
You are also going to want to change your voltage regulator to an electronic unit.They have a stock looking unit available that bolts right in.
Are you working on a 6cyl or 8cyl ?