Cam/Head Swap Disaster.......

"I had the intake milled to cleaned up as as well as the heads." Did you mill the end seal area as well to provide the proper space for the end seals? (If you used RTV sealant this is a non-issue) If you took enough off the port flanges and heads, I have see them not seal as the end seals are then too thick to allow the intake to sit low enough for the flange to seal against the heads.