New guy intro/ IAG aos question

Hey all! I just purchased a 2015 STi launch edition. The guy I bought it from was a second owner and he blew up the first engine. He replaced it with an IAG stage 2 block (verified by riveted tag) and had some headwork done by a local and reputable machine shop. He had the cylinder 4 coolant mod done, IAG oil pickup and baffle installed as well. The chassis has 148k on it but the engine has 19k on it. During purchase negotiations I pointed out that the under side of the engine was considerably wet with oil. No blue smoke or any white smoke after startup. Coolant in the res looked good so I ended up dickering him down and purchased it. It's been tuned to 290hp (via dialed in performance in Rochester, NY) and the AFR gauge reads mid 10s at WOT.

Anyways, no dripping oil since purchase and oil change so my guess is the oil is either from the reuse of the old oil pan or the pcv system. I'm trying to install all reliability mods at this point so I bought the IAG AOS and a used grimmspeed TMIC. I went to to install the AOS last night but the directions for the 2015+ sti's doesn't match my car... I stopped the install and went in late last night and checked iags website and the 08-14 sti instructions seem like my engine... Am I missing something? Did my seller dupe me? I'll attach pics of my engine bay. The most notable things were the disconnects and electrical connections for the crossover pipe that I don't have, also the recirc pipe from the stock intake. Any help would be appreciated!

I'm pumped to be a part of this community!