Pennsylvania keeps it's original borders

WI, Pennsylvania kept the borders in William Penn's original grant. Southern border 40°N and Northern border 43°N? Strangely enough Philadelphia would now be in Maryland and Buffalo would be in Pennsylvania. Niagara Falls would be less than 10 miles north of the new state border.
 
Wonder where the western border would fall out.
The charter calls for "the said lands to extend Westwards, five degrees in longitude, to bee computed from the said Easterne Bounds," which, given that the eastern boundary is a river, seems impractical to survey.

By my calculations, the northeastern corner (due north of the headwaters of the West Branch Delaware River) would be just east of OTL St. Johnsville, NY; the northwestern corder would be about 6.5 miles north of Dunnville, ON; and the western border would not be so far west as OTL's, barely including central Pittsburgh. (Pittsburgh would be excluded if the western surveyors mapped the border as a single meridian, rather than paralleling the river.)

Now, the charter as written does have an undefined corner: the border is to be drawn from the Twelve-Mile Circle "unto the beginning of the fortieth degree of Northerne Latitude", even though the two circles don't actually intersect.
 
Morelikely New Jersey gets Philadelphia, since it would make sense to found a city on that bank of the river - what you might see is a situation like St. Louis where the one side of the river (OTL's Philadelphia) becomes much more prosperous than the other.
 
Wonder where the western border would fall out.

The charter calls for "the said lands to extend Westwards, five degrees in longitude, to bee computed from the said Easterne Bounds," which, given that the eastern boundary is a river, seems impractical to survey. ...

OTL the practical limits seems to have been not far west of Ft Pitt. In 1775 The governor of Pennsylvania seems to have been unable or unwilling to send a expedition of militia much beyond the present wester boundary.
 
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