i run a 3ohm coil so i can run straight 12v and a hot a** spark. but the best bang for the buck on a stock setup is the petronix 45K coil.
also a must to run a
Blue streak CH-410 brass contact cap
Echlin MO-3000 long tip brass rotor
Ebay 500ohm Wires (im on my third car with them, great fit and price!)
hot coil