I know this sounds weird but I'd go with 300 Yamahas or 300 Mercs. I've got 2018 Yamaha 300s on my Marlin and it'll do 50mph, that being said the new V8 Mercs have so much mid range torque they feel (and perform) just as good, if not better, than the L6 350 Verados. You could also wait until...