I believe it’s a Blackhawk S7, My concern would be the Internal condition. I can’t help but think the entire valve system, Rod finish will be shot. The Jack will use Vee packing for seals, so the Rod finish needs to be A+. If you got the $$$ and resources anything is possible. I’ve been there and done that and at the end of the day I send those jobs on down the road. If you scour Facebook or CL you can find better examples to start with for not much money. Good luck and if you have any questions don’t hesitate to ask. A word of advice… Without a donor jack everything to you destroy tearing it apart will need to be manufactured, Blackhawk also used specialty tools to secure compression nuts on the Main ram/pump pistons. It’s possible to work around them, but if they are froze take your time with PB blaster/heat before grabbing the Hammer and punch.
Good luck