I have a 1991 galaxy that had a 3.0l omc cobra set up but it had a cracked block so I swapped a 1976 2.5l omc I got for dirt cheap. I did this swap 4 years ago. The engine runs great but the problem I've been having ever since the swap is the outdrive. It feels really weak on take off and doesn't go as fast as it should. With the 3.0l I had a 18 pitch but that was not good so I ended working down to a 11 pitch and it running the. Eat it has since the swap but it's still lacking. Wot is running 3200 rpm at 27 mph and since the pitch is so low it looks like the drive is up a little while driving because it looks like it's spitting the water upward. My next assumption is that I have to change the gearing in the drive. Am I correct with assumption and if so what gearing do I need? Has anyone done this swap and have any information that would help? Thank you in advance.