I repowered in late summer of 2016 with a 2017 Merc 60, 4 stroke. I'm not positive but I think it's pretty much the same motor but the CT has a heavy duty lower unit or something like that.
I run mine on a 17'-6" Tracker Pro-v 17. Boat runs right around 32-34 mph. I'll fish a couple of times a week and it's been good for me over the last 18 months.
If it's hot or cold or anything in between that motor starts right up and purrs like a kitten, it has plenty of power and is easy on gas.
No regrets for me, I love it.
I'm not sure why you want the CT, I would check with the dealer before you go that route.
BPS had the best price when I bought mine.