Many of your points are quite valid, but criticizing them for sticking with pushrod technology is not fair, I think. Their engines are fine...look at the LS7. Pushrod engine. Also, DCX is also using pushrod engines (like the Hemis), and doing quite well with them.
Meanwhile, Ford, which has OHC engines, is most behind the curve on power.
"Meanwhile, Ford, which has OHC engines, is most behind the curve on power"
I believe you will find the new Shelby Cobra with the supercharged 5.4L DOHC 450hp engine far from "behind the curve on power."