Ok here is the deal, i was driving my 66 mustang with a carb 5.0 in it and when i got on the gas, white smoke came out. so i was thinking a blown head gasket. so i replace the head gaskets and put everything back together correctly. so when i go to start my engine it kept on backfiring and not being able to idle at all. so i found TDC again and tried again. I also tried 180 degrees out and still no luck. it back fired and started a small fire on my carb, but i put it out and everything is ok, so this is where im stuck, i think its still a timing issue but im not sure. i have checked the firing order over and over and tried finding tdc and trying 180 out. so please help me !!