I just did this swap last month. I used a 1.5 inch Daystar spacer in the rear, new FJ coils, and the front Bilstein 5100s on the first notch up from the bottom (.85?). I tried setting it higher, but the main thing that I noticed was that the downward travel was significantly limited due to my stock upper and lower control arms 'n ball joints. I noticed when I jacked the 4Runner up, with the ride height set higher (second notch up from the bottom (1.75?)), the tires lifted up off the ground rather quickly. With it set just one notch lower, there was significantly more downward travel in the suspension. So, although I actually preferred the way the 4Runner sat with the higher setting, I was really more concerned about the suspension bottoming out when I hit our huge Michigan potholes at highway speeds. In addition, pay attention to the CV axle angle. I don't know how much is too much, but I know when I had a 2.5 inch lift and NOT using a differential drop kit, my CV axles wore out pretty quickly (maybe coincidence).
If I would do this again, I would go with an aftermarket upper control arm that uses a ball joint that allows for more travel in the suspension, THEN put it at the higher setting (1.75).
I measured the slope of my driveway and then the floorboards on the 4Runner and found a 2-degree downward rake in the front...not bad. The ride is firm, but not harsh. If you are raising the center of gravity of the vehicle with a lift, it's a good idea to use the higher spring rate like the FJ coils, as it helps with stability when cornering, and reduces front end dive when braking. The FJ coils are a nice choice for a mildly lifted 4Runner.
