Alright, I've been playing with this off and on for about 4 months now. I have an 87 roller 5.0, stock cam, stock heads, stock non-adjustable rocker arms. I'm trying to start the engine and it keeps backfiring through the carb, and then I get flame on top of the carb. It seems like I'm running too far advanced but I've played with the timing so much. I even removed a valve cover to make sure my rotor was hitting the dist cap at the right spot. Or, it also is like my valves aren't closing all the way. Is that possible with the stock pedestal mounted rockers? Since, I've replaced the spark plugs, dist condensor, made sure I wasn't 180 degrees off on timing, correct firing order 13726548. I checked the carb, accelorator pumps are fine, squirters fine, float levels fine, power valve fine. I even swapped carbs with a car I was driving today that ran fine, same backfire through the carb and flames. So I'm sure its not a fuel issue. I am almost sure it is ignition. Maybe its the dual points. Any ideas?