For new parts (seals, gaskets, pistons, bearings, etc.) check out Craig at Redline Motorsports (http://www.redline-ci.com) he is in California and is very quick about shipping and has very good pricing.

And of course Tyga for other parts/used parts is a good option.

When/If you ship the engine, pull the plugs/cover the holes with tape and do as much cleaning as possible on the enigne as you can. No mechanic likes to work on dirty engines, and no customer likes to pay shop rates for a mechanic to clean things up in order to work on it.
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Charles Gallant