Building a 408 stroker

For budgetary purposes, I'd run 587s, 308s, or pretty much anything you can get cheap. Magnums are nice, but IMO are not big enough in any stock form except the MP commando versions to feed that stroke. As Rumble said, all should have a performance valve job done, and bowl blending/gasket matching done to them. Running iron heads on such a long stroke, I would go larger on the cam shaft for the 408.

For the 360, really again, any head will work with the same prep. The Magnums would also work for the 360...