Yes you can run a stock coil, but you will only have the factory spark strength.
Add an HEI Ecoil and you have a much more powerful ignition.
I know people say "I don't need a stronger spark" when in fact you will get better starts cold or hot, smoother more stable idle and a lot of HEI users get better gas mileage than they did with factory parts.
The pertronics unit is just a switch, but the coil is what makes the real difference.
