Mark, LMS in WaterFord is a complete service center. They did the machine work on my Boss 351.
They do a good assortment of engines and are reasonable.
What are you looking to do? Do you want to do the assembly and have a machine shop perform selected tasks or are you looking for someone/place that will take delivery of an engine and return an engine?
I suppose it could be a nice winter project if you have a heated garage. Doing stock is farely easy, it's the performance stuff that takes time and effort.
Let me know what you're thinking, maybe I can help.