I just got done puting on new points, condesor, rotor and cap on my car and when i started it back up i got a backfire through the carb. so i thought the timing was just off so i fooled arouund with that for bit and that didnt help. checked to make sure all plug wires were in the right spot, tried disconnecting the vacuum advance, still backfires. so now my next guess is i have an intake valve stuck open. i put new valve cover gaskets on recently too so its possible something might have gotten in the head to cause the problem. what do guys think? engine is a stock 327/210hp 2barrel carb. any suggestions are greatly appreciated.