1996 Buick Lesabre engine

Does anyone know where I can get a 1996 Buick Lesabre engine or would I have a better chance just going to a junkyard and pulling one out?

If pulling one out is a good idea does anyone know a place in the Bay Area where I can pull out an entire engine without having to worry about it missing pieces?

Thanks for da website but I think I may just try and salvage the original engine.

Does anyone know if a rebuild kit would fix a blown head gasket?
Or does anyone know if that Heal-A-Seal Head Gasket Repair stuff actually works?

Thanks,
Andrew