ok i have a problem.thede were the pistons that were in my block H423NP AND THE THEY CAME EVEN WITH THE DECK, i called summit and the said i should bye this kit fem mhp 126 but they said they dont know if it will stick out of the block. the old pistons were -13cc and i hope thees pistons are not. what cc are the new ones? what comp will i have with 76cc heads i ahve looked all over and can not find this info