building a LZhybrd is more involved than just slapping a Lseries on a z series block. more so if your useing a Z24, putting a L head on a Z24 is not for your average builder first the timing chain has to be what you would say custom made due to the Z24 being the tallest block and thus the front timeing cover will have to be custom also then you will have to piece two headgaskets together the Z24 headgasket with the front most part of a L series gasket and putting a p-nut head may give too much compression and not be able to run pump gas and may have troubles with blowing headgaskets and overheating. good luck in your build just do some reasearch