Eduardo,
So, you ended up with a 35. That's cool. What year and model? I wish you could have come to look at my boat in person, I have a feeling the broker might have done you a disservice by recommending against it! No hard feelings though, and welcome to the FORUM. As a Commander owner in the Yucatan, you are probably in a pretty exclusive club. As my boat does have SBC's and weighs in at over 22,000 lbs. I can assure you that you have plenty of power. However, as was previously stated you will suffer a lack of top end. I am sceptical of the PO's claimed cruising and top speed. As I noted to you while we corresponded about my boat I cruise @ approx 15 knots and top out @ approx 21 knots. I am also considering the stroker option during my rebuilds. Thus far my opinion is that risk/reward is not favorable. I figure I would be lucky to 4 or 5 knots, but lose economy and longevity of engine life. Knowing myself and my weakness for speed, I figure I would probably run the dog crap out of 'em. I would entertain increasing the low end torque for more response in docking situations ,but I don't see how the extra top end is all that relevant. Even if I was running the 70 KM to your atore, I can't see 5 knots making that big a difference. What are we talking 45 minutes or so each way. That would be a little extra time to tackle up or just sit back and enjoy the ride. That is what it is really all about for me anyway.
Good luck getting into the nitty gritty of Commander ownership. Learn how to use photobucket and share some pics of the boat and the atore and the fun you will be having soon.