...Is anyone "marinizing" these engines for marine use? Seems like they would be a viable choice since they have a strong torque curve and have been in production for several years.

Haven't seen any, but would love 2 of them in my Magnum. I built a 392 Stroker out of a 6.1 with ported heads and a fairly aggresive cam, made 550 HP and got my GCSRT-8 into the 11.teens

So there you go...a pair of 500+ Horse 392'sin front of a couple of Bravo 1's would make a sweet package!!!