L.A 360..Magnum ?

Both the Magnum and the LA make for good combos. But if you already have a good la then I would definitely go with that it'll also look much more at home in the engine bay with its five valve cover bolts and it's proper angled manifold bolts. I think the condition of your heads will make a big difference in which direction you go if the heads have been rebuilt and are in good shape that would be great if they're shot then you'll have other decisions to make.