patriot headers?

I have a set of the shorty street rod style on my rod and after install both sides leaked at the flange like the gaskets were not lined up , had it take them loose and restamp the gasket holes lower so i could raise the gaskets got the drivers side to seal after 3 attemps and the pass still has a little leak, its like the flanges dont line up with the ports right , still trying to figure this problem out ? thanks dartman 440