I know this has been discussed before but I was asked by a forum member to present my specific question. Will 6X-8 heads fit my 389 as currently built. My engine has the 8 valve relief pistons with the knotch at the top of the cylinder wall.The pistons appear to be at zero deck. I could buy a 400 head gasket to see if everything on my 389 lines up but would like to hear from those of you who have hands on experience with this type of set up. I havent had the cam grind checked but it doesnt appear to have a high performance lift. Will this work?