Drive gear ratio is wrong between a V6 and 3.0L, won't work, you won't be able to prop it low enough. It may bolt up and run, but the boat would be a dog, lugging the engine (bad). The cost to re-gear the V6 drive, to work with your 3.0l is cost prohibitive, cheaper to get the correct drive. You need to find the correct ratio drive, 2.0.
What's your budget?