You won't make enough power NA to worry about breaking the powdered metal rods in your Mach. With that said I'm not sure its worth the money to port the C heads with the displacement you are running right now and it will suck when a 2V with a S trim walks you for less money. I mean you already have the revised C heads on the car you have now.
Whatever happened to that cheap Eaton swap you were planning on? IMO that would be the way to go.
2000 Mustang GT Steeda build #48. Bolt ons, suspension, Novi 2000.
Just because I give you advice, doesn't mean I know more than you. Its just means I've done more stupid ****.