U LUZ

im fixing to purchase my lun 395 kit ,,,i have a couple of questions why are there two different kits the ls1 and the ls6 kit????i think one is for 67cc heads and the ls6 kit is for 64cc heads ???am i correct ????yes i am using ls6 heads so do i need to use the ls6 kit ????i would like my compression ratio to be at 11.25 to 1 how much do i need to mill my heads??? will 60cc be enough???also what is the best cam to go with ???/give me some sugestions....