Ah. That DOES change the equation somewhat *grins*
Still, you'll need elephant ear adapters.
Why not pick up a 5.9 Magnum block, and move the cam et al over to the Magnum motor? You'll need Magnum heads drilled for an LA intake, but everything else (cam, lifters, crank, rods, and if the bore is compatible, i.e., old motor is say a .030 overboard and the new one can work with a .030 overbore, the pistons and rings) should move right over. Well, you'll need Magnum compatible lifters to pump the oil up the pushrods to use Magnum heads, but I bet you'll find it actually breaths and burns a bit better than most LA heads.