The speed wouldnt be my concern, it is the hole shot that I feel you wont be happy with. I have been in a lot of 18 boats with 150 optis on them and when you have more than 1 person and a full live well, hole shot isnt very good on that shortblock. I have also been in a pantera classic with the 2.5L 200 and the hole shot isnt good either. Take it for what its worth but I would never put a 150 on a 19+ boat like the new Classic.