just puttin the head on the LS motor wont be optimal, you wont make as much power as you want, you wont be able to rev as high, and your long term dependability will go down. but, you can do it that way. id recommend using the golden-eagle LSVTEC kit if you want to make it easiest...

but id also recommend upgrading your rods, pistons, etc to make the best power and dependability... this is stuff you can find searching. any more questions that you cant find answers to, ask away.