I've done a ton of idling and I'd heard the same thing. I always kept the idle above 1000 rpm as I'd heard it helped. After all, this is a street car.
I think I'll just buy a new set and sell off the old ones at a steep discount and let somebody else rebuild them. I like to error on the safe side of the fence.
Gaetano, I'll take the bait. How about 268/272?