Better Directions to Phila Park

[jminrod]

I am thinking going to philadelphia Park for the PA Derby. The problem is I am not sure of where their website is telling me to get off the NE Extension.
I will be coming from the allentown are S on 476 it looks like on Mapquest that I should be able to take 276 off of 476. But the website has exit 351 which I don't see on mapquest. Any help would be greatly appreciated.