SC30008KAF. 8 gpm, 3,000 psi. It was born with a 27 hp Kohler on it. (maybe a 25, as Hydro Tek upgraded to the 27 hp a couple of years ago)
The inlet fitting on the pump isn't original. I should be a brass elbow.
Before you sink any money in to it, pressure test the coil to see if it had frozen or rusted through.
What's the serial number?
Call me if you need anything, I've been selling Hydro Teks for better than 10 years now.