it is going to be an lq4, which is a lower compression lq9. still a great engine, same rods, crank, block, heads, intake, etc. as the lq9 just different pistons.
i am balls deep into a lq9/coupe swap right now and i just have to say, be ready to spend more then you plan. i am doing an lq9, th350 w/sbc converter (and gm adapter), 4th gen lt1 radiator and fans (thicker then the ls1 radiator and bolts in perfect), 351 swap headers with ls1 flanges welded on, aje k-member and crossmember, custom driveshaft, custom pcm with modified stock harness, and the list goes on. there are cheaper ways to go fast, but i am a die hard gm guy and picked up a coupe roller that has over 10k in just suspension, brakes, wheels/tires, and cage so i plan to make some serious power.