If I was going to do serious modifications on a 5.0 I would replace the heads and intake manifold, which pretty much defeats most of the advantage of going with a 5.0 Cobra vs. a 5.0 GT.
If I were going to just do light modifications then the DOHC has a 60-80 hp advantage out of the box and responds very well to basic bolt ons.
Neither engine has any significant maintance issues.
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