wtucker you might go to www.moparchat.com & scroll down to & click on circle track chat & peruse Sanborns cooling mods that are in a sticky at the top of the page. It'll answer your Q's. It's SB orientated but can be easiely adapted to BB's as well. You will be able to add holes to the block/gasket & plug ones that are defeating the purpose. top notch material!