look into getting a set of aluminum subframe bushings as well. this improves things quite a bit.
some others say that there is noise/vibration/ride harshness issues with using the aluminum bushings, i've had them in since february without issue, i love em, and i feel that they were a HUGE improvement over the stock ones i had. I also lucked out and found a member that was in the mood to completely unload every SHO part he had cheap and scored re-enforced motor mounts, and a new transmission mount. everything is so much tighter now and i can rev my engine with the hood up and there is little if any noticable motor rock.
while you have the valve covers off i seriously recommend cleaning the crap out of everything in sight you can reach, and being very careful taking the valve cover bolts on and off, they bottom out in the head, and are kind of difficult extract and to replace if you break one and arent so lucky to find a SHO in the junk yard. also, try and find a set of motorcraft plug wires. the aftermarket ones dont have a very solid fit and most people here run stock wires.
you should also look into doing a front 60k if you haven't yet (timing belt, water pump, cam seals, cam sensor, crank position sensor, belts, hoses, front main seal, etc) once again i was lucky and the guy i bought all my SHO stuff from already had a spare motor with a front 60K done and 0 miles on it, so i am gonna swipe all the stuff i listed (minus the seals, i have new ones) and do mine soon.
when your clutch burns up and you are ready to get your clutch changed, you should strongly (IE definitely) change out your rod bearings. this, and anyone feel free to correct me if i am off base, is a weak spot in the engine and the bearings can go bad pretty easily, once they do... not good.