i was in the process of ordering a thicker head gaset since i am going turbo and blew my old one anyway...they range from .27 all the way to .74 in thickness. My question is if it is okay to go with the thickest gasket to lower compression. i have no motor work done it is still a stock head and block. and also cometic only has 75.5 bore avaliable but my stock bore is 75 so is it okay to use the 75.5 one without getting my block machined...any help is much appreciated