Welcome Murfdog!
Congrats on your Sundowner! We have a '88 235 Sundowner that we absolutely love!
Our boat has the 5.7L OMC so I can't help much with your question on top end. At 4300/4400 rpm we run 40-43 mph. Our boat is equipped with trim tabs as well, that helps get on plane and keep the bow down.
To post a pic you'll need to find a hosting site for your pics. I use Photobucket, some use Flickr, and I'm sure there are more out there. Those sites will give you a link and/or image code to copy and paste in your posts.
Where do you boat?
Good luck with the Sundowner! I hope you and yours enjoy it as much as we have enjoyed ours!
