Well I put the Mag 1200/1800 pump in and all is well.
It took about 45 minutes to get the pump attached and running. 10 minutes of this was rolling and securing the 18' of cord they come with
At the suggestion of a local irrigation store, I installed a 6" double-swivel 90-degree elbow contraption to take up any slack from the different pump case sizes.
This along with the ball-valve & there were no problems getting the flow set right - only took about 5 minutes and a couple of trial settings.
Unfortunately, the label on the replacement pump is scraped up, so I can't tell which model it is, but I'm sure when the impeller needs replacing, it'll be the more expensive style
Vic