MOPARJ
What can I upgrade now?
I know this is an old thread, but something else to consider on Magnum motors is that the plenum gasket on the bottom of the intake is likely leaking or blow, causing oil consumption and a lean condition. If you introduce any ECU tuning, it will probably also introduce pinging. Hughes Engines sells a kit with aluminum plate to cure this issue for about 200 bucks. Take a peak down through the butterflies and see if there is any oil residue pooling in the intake. Who knows....it could be worth a few tenths just in itself.