Ditto to Jack and Hoss,
There are "Code Talkers", AND there are "Code Listeners".
Any time spent on this list, or on any other HONEST site dealing in this stuff will let you know that this is DIY, not plug and crank.
I think it's imperative to do a "tear down" before you run, if only for self education. This is YOUR BABY!!!
The guys I have chosen to buy from make NO illusion about the possible "issues" with these. I chose the same source as you, BUT I EXPECT, and intend to completly dissassemble, clean, inspect, replace, polish, tweak, etc., before use. If none of the big parts are broken, and all I need is lines, bearings, rings, etc., I'm Happy!!! IMPO, once you work out the small issues, and start producing BTU's, KwH's, GPM's or whatever you intend, you'll forget all about the fact that this thing cost less than ~20% of what it would go for if still made "On the Island" or here. The PS guys, IMPO, are first rate, old time, NO BS (from them OR you) guys.
Kevin