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Exotech in NH is supposed to be the cheapest good place.
I can second this motion. Had 3 motors in different cars done there. He's also done a lot of 3.8 RSR and some other short stroke stuff in race cars. One of the best on the East coast.
Exotech did my top end 30k miles ago, runs beautifully, doesn't use a drop of oil. But you'll have to be patient, he's a one-man show, busy as hell during race season and he races, too. I left my car there during the winter. He's done several Rennlister's cars.