You didn't gouge them when you put the heads on? I know sometimes it can be a pain to line up the dowel pins when your putting head back on when the motor is in the truck. I've used those low cost blue felpro head gaskets you can buy from just about anywhere on a couple motors and never had problems. I have a friend who builds a lot of small blocks for people and he normally uses these gaskets too for anything that is under I would say 10:1 ratio and I don't think he has had any problems either.