14092360...86-90...oval...OPEN...454 Truck, "peanut" round ports
This is from Mortec.com. Check your numbers when you have the valve covers pulled. Im sure they make tons of power, but Im just saying they are not a performance head. I dont know where the HP came from in your description, that's not part of the number as far as I know. And 10/1 is ok for the street, depending on the cam you choose...but typically you dont want to more than that with today's crappy gas. John Oh, combustion chamber should be somewhere around 120cc's or so.