I have a Pertronix 1168LS ignitor but I'm not sure about the correct coil. I have a Pertronix 40,000v 1.5ohm coil but I'm wondering if I should have a 3.0ohm coil. I don't see the ohms stamped on my stock NAPA no resistor required coil. The stock distributor will be used for installing the ignitor. Thank you for answer. 1.5 or 3 ohm coil? Will need thr full 12v .