Should Manny Pacquiao practice more on running and chasing because Floyd Mayweather will make the boxing ring as race track?

No he just needs to be aggressive and make sure he gets mayweather into the corners. Mayweather is a hit and go type and the judges will most likely give to mayweather for his hits accuracy

Pac man may still win and Pac Man has gotten a KO Victory in past 5 years

I don't know but i do know that the fight is being held in Las Vegas which will give Pacquiao a very small chance of winning due to the fight being rigged by the judges Mayweather will most likley pay off some judges.The only way Pacquiao takes this one is unless he knocks out mayweather which is pretty unlikely to happen since paquiao hasn't gotten a knockout victory in over 5 years.

No because Mayweather will stand his ground and walk him down.

He should cut the ring off

Yes. Pac should practice how to get out of the clinch, too.