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 #0048 34k miles. 99 Cobra 4V swapped, FTBR IRS swapped, exhaust, tuned by James Gordon.
Just because I give you advice, doesn't mean I know more than you. Its just means I've done more stupid ****.