Permatrim or Trans CP-100 with a 3x cupped Foreman prop. Recommended from guys that run same/similar boat in Texas.
Only wanted to comment on the SWFL use (I'm sure all the other stuff will be way cool): I'm not sure you need to do a bunch of special stuff to your motor just to run 3 or 4 times a years in super shallow ENP. I think this boat will run pretty darn shallow without all of the Texas accoutrements. Those guys spin up in mud and run many, many miles in 12" of water. I fished my HPXV in the Park in the dead of winter and it was fine. You should consider where you will fish the boat 90%. Just my opinion. Have fun with the process.