Oh I see. Real quick like here is what you could do - the compression ratio is 9.4:1 on an LQ4. On an LQ9 its 10:1 giving it that extra HP bump. On an LQ9 they used flat top pistons to get the extra compression. You could easily just swap to a thinner head gasket and get the boost in compression ratio. And since youre going to have to tune anyways, why not.
Or you could just slap a cam in and be done.