engine wiring help

Why don't you also purchase an MSD 6AL ignition system. This will make the wiring easier yet. No wires from the original harness to the coil. No wires from the original harness leading to/from the distributor. Just a hot [crank & run] to the small red wire of the MSD box. Wire the MSD large red to a battery hot terminal [full time hot] and a ground to good metal/battery negative. The other leads [wires] are supplied by MSD to the necessary components. [coil/distributor]