I would not go more than .020 personally. I know for a fact that if you have an aluminum block it gets dicey after that. My Teksid is stock bore and I'm going to try to get it to hone up true at the stock bore or just go .010 over if I can. That is if I decide to go ahead and build it vs selling my car.
2000 Mustang GT Steeda #0048
Just because I give you advice, doesn't mean I know more than you. Its just means I've done more stupid ****.