What is the overall length of the 300? Is it 30 +swim platform or is it 30 including? Does boat year make a difference?

It's 30' counting the swim platform. It used to be called the Convincor 283.

Yes boat year makes a differnt I believe sometime around early 2000's Checkmates started calling the 28 checkmate a 30 foot boat. Keep in mind checkmate true both lengths are 28 and 30. The 28 came with either single or twin most 30 all twin good luck.

thanks guys...just trying to figure out what i want to move to next!

Checking out the one at PBC?

Yep

I like that boat. Should run solid with the 496's in it. Seems to be under-propped considering my 454 Mags turn 27's and 28's behind my boat.