The angle-valve IO-360 is guaranteed to overwhelm a standard Vans small 7-row NDM oil cooler in a dramatic way. If I remember correctly... all angle-valve Lyc IO-360s have piston oil squirters which raise the amount of heat absorbed into the oil by a large amount. Most 200hp angle-valve IO-360s I've seen on RVs and Glasairs have used the big 13-row oil coolers along with some kind of air valve for restricting the airflow in the wintertime. On a -7 the physical fit will be very tight, so if you haven't yet started mounting stuff onto the firewall and routing cables thru it, etc, now might be a good time to reserve some firewall area for possibly mounting an oil cooler there and running a scat duct over to it.
We went thru quite an ordeal with oil coolers with a high-compression parallel-valve ECI Titan IO-360 in an RV-8 and would've saved a lot of headache if we'd just put a big oil cooler on to begin with. Now we have the SW 10599R and it is proving to be just the right adequate/nominal size for our engine.