Just port matched and tidied up aroind the pushrods. I can't believe the stock heads will only support 300 hp? I raced Fords years ago and all we did was tidy up the roof of Clevo heads and good to go!
don’t even start comparing a stock Mopar head to a stock Ford head. Lol. Cleveland is a story of its own. Get an aftermarket aluminum head and clean it up some and you will find your missing ET.