Where do you pull these spark plug numbers from? Anyway Edelbrock recommends Champion RC12YC plugs for their heads. Now if you want to crossreference that to a NKG plug it is BKR5E. Another thing about the timing. Always unplug the vacuum line from the distributor while checking or adjusting timing. Loosen the distributor lockdown and set the knob on the back of the timing light to zero. Adjust the initial timing to 10*-12* BTDC. Have someone rev the engine to 3000 rpms and point the light at the scale. If the line on the balancer is past the 0 mark on the scale adjust the knob on the back of the timing until the line aligns with 0 on the scale. What is the reading? Do this again at 3500 rpms to see if it changes or stays the same as for 3000 rpms. The reading should have been close to 35*-37*. This is your total (initial + mechanical advance). Now unplug the vacuum hose and connect it to the distributor. That's it, you can check to see how much vaccum is added by revving the engine to 3500 rpms, zero the timing light and check it by turning the knob on the light until the balancer line aligns with 0. What is the reading? 49*-51*. Good. Take the foam out of the tank. If you have enough fuel in it the pickup will stay wet.