904: should I switch to 727?

Well, crap, forgot to put more pertinent info! I haven't gone through the engine yet, but will likely run a mild cam, and have the cylinders bored to the next size as needed. I have NO idea about final horsepower. I think stock was what, like 270-275? I'd like to increase that a bit just for bragging rights, but nothing crazy. I currently have the 3.91 third member, but I'm considering something a little shorter so I get a bit better mileage, more in town / longer drives drivability. If that makes sense.