question on building compression in a lm7

Hey all, im building a 5.3 lm7 i have pulled out of my 99 silvy right now, im looking to jump up the compression on it. Ive done some research and thought 4.8 flat top pistons would do the job fine, but turns out they stick out of the hole too much. With more research i found the 5.3l L33 high output runs flat tops in it also. has anyone ever used l33 pistons in an lm7 if its possible??? looking for some guidance here