Can I run 360 la extractors on a 360 Magnum

Hey guys I've got 360 pacemakers to suit in LA engine. I want to run them on my 360 Magnum that's running enginequest heads. I've checked out the difference in the ports and the LA extractors are much deeper and nearly come off the bottom of the Magnum head. They only touched by 1 to 2mm at the base. I'm thinking they may leak. Another option would be to run the Magnum head gasket which would help cover the whole but I'm not sure if it would just blow it out.
Has anyone run these successfully