first off, we need to trade Cincinnati for Atlanta: Reds in the East, Braves in the Central ... the "new" NL East would look like this today

Montreal 79-79 -
Philly 79-79 -
Cincy 77-81 2
Florida 77-81 2
New York 74-83 4.5

with todays games Atlanta beats the Phils, Cincy beats the Cubs, and Florida beats Montreal ... then over the weekend Cincy takes 2 over the Expos, and Florida takes 2 over the Phils ... and then we have the Mets who charge thru the end of the year with 5 straight wins .. then we got this

Cincy 80-82 -
Florida 80-82 -
Montreal 80-82 -
Philly 80-82 -
New York 79-83 1

a 4 way tie atop the NL East and the Mets lamenting and replaying EVERY close loss throughout the year and some very mad fans in St. Louis, San Fran, or Arizona cause their team didn't get in while one of the 4 aforementioned would get it

This is a cute idea, but if the Braves were in the Central and the Reds were in the East then the Expos, Mets, Marlins and Phils would have a lot more games against the Reds and a lot less against the Braves. So the odds are that their records would be rather different.