Thank you. I have the heads now on the 5.3. I was wondering if I should go with a long block or short block in the 6.0 from a cost point. The heads would have to be reworked new guides and seals because of the miles and I could have a port job done at the same time for better CFM. I just didn't waste money if there is no gains to be had. It seems that we will plug and play the 6.0 as I have a K&N air box and the Superchips flashpac tuner and duals already on it.