Magnum Exh Manifold options

abody said
LA headers with a small amount of massaging and remflex gaskets will work, have been using this set up for 4 years and no leaks

Same here, no problems at all and the remflex gaskets were even used on the previous motor with headers.
On my last motor I had a busted off stud on the rear drivers side so that is when I got the Remflex gaskets and it never leaked.
Just can't recommend those gaskets enough for headers.