Magnum intake on LA engine??

Well, making it work is a project probably not worth the effort since it would probably not pan out the way you would like. I would look to an updated intake.

A single plane with boss' for the dry F.I. system like your doing, MoPar has them for the Magnum heads. I'm not to sure if the older intakes would fit the plan. I'm sure it would be easy to drill and weld in bungs on an older intake even though the boss may not be there.

Or use Magnum heads on the LA block and proceed with the beer bbl. intake.