I want to thank you fellas for all the info. I was having the same problem,I just installed a new Edelbrock manifold & 1406 carb. found that the distibutor was "off" (HEI) brought up #1,then moved the dist. and DAMN the ol'girl fired & idled! YeeHa! Although, tell me if I'm right, half-way through slowly pushin' the fuel pedal down, I get a small (much smaller) backfire through the carb. Could I still be 1 tooth off on the distributor???