Factory eco injection.

autopar3000 said
OE Magnum wouldn't be that hard. Here's an adaptor for the crank sensor:

3.9/5.2/5.9 ENGINE - Crank Sensor Adapter - HiPoTek

There are reasonably simple solutions to any of the other issues that would come up.

For most of us, OE Magnum would be the cheapest option to get MPFI on a small block, and when you're done all your replacement parts are catalogue Chrysler pieces. Just go down to a local yard or find a guy parting out a 2nd gen Ram and pull the harness, PCM, distributor, intake with injectors, sensors, and throttle body. (While you're at it, just could pull the 5.2 or 5.9 and use the engine too, but that wasn't the OP's question.) I got that entire list or parts off a guy for $100 CAD. He was parting a truck and only wanted the engine.

That's a neat adapter- I'll have to save that link.
I still don't see how the factory kegger manifold could be adapted to LA heads, though. Redrilling the manifold bolt holes at the proper angle would have the center bolt holes going into the plenum, and no good way to get in there to bolt them on. Let alone getting in there to machine some flat pads for the bolts to seat to. Possibly redrill the heads at the Magnum angle, but then you'd probably be better off just swapping on Magnum heads (which in turn requires the necessary valvetrain mods)... and at that point, just swapping in the whole motor becomes a lot easier..

Am I missing something?