Congrats on the success in FL, and the lift.
Several posts on this. Many folks use the Perko system with the check-ball inside. Personally, I don't like it. Its got moving parts that break and get stuck. With just an open T-fitting as I describe below, it flushes the drive when you turn the water pressure on. Then when you turn on the motor, the SWP will suck the water into the motor. The check-ball setup will not flush the drive. Some choose to install a cut-off valve between the T-fitting and the drive. Others have sea-strainers with a fitting or way to insert a water hose directly into the sea-strainers.
I made my own with parts from a few of the marine suppliers. Its pretty easy with T-pipe in the raw water pipe, and a garden hose attachment that is on a hose off the T-fitting.
I picked these up two seasons ago for my 496HOs (prices & part numbers may be old):
128-5001 Hardin Marine Fitting $39.99
HDN-1234 1/2NPT X 3/4H CHROME BRASS FITTING $7.70
(Pick your preferred barb size from their website, depending if you want to use 3/4" or 5/8" hose. You will need a 90* fitting to attach directly to the T-fitting into the SWP hose line. Its just a typical Teflon tape screw in connection.)
I am going to pick these up to finish it off nicely:
Flush Connector 620-913300 $129.99