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Forget the GT-40X heads. They're grossly expensive and you don't need aluminum on a truck. Plain old 3-line GT-40s are your best bet and not all that hard to find since a lot of guys who had put them on their Mustangs have upgraded to aluminum.
As for the oil, they're reducing the ZDDP content of Diesel oils as well. Flat tappet cams with high ramp angles are simply no longer a good idea.
A built AOD will handle most anything you throw at it but a stock one cannot. The biggest weak point is that silly two-piece input shaft
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