If you could have checked the boat when it left the factory nearly 40 years ago , you would have found it not to be "square and level". Rarely is a fiberglass , or any other boat material, ever symetrical new or old .(Now it is possible to use computer controlled routers to fair a mold, but very pricey.)
I have seen boats that were an inch and a half wider ( from the centerline) on port over starboard. In other words , don't fret it unless you can see it by the unaided eye ( no levels or strings stretched tight ).
The original molds were made from a 'plug', made by men from wood, lots of room for error. When the mold is pulled from the plug, more error, and when the hull is pulled from the mold, even more error. Then it is all assembled by minimum wage workers, think they really cared how 'square' the boat was. Not until the bulkheads were in and the deck installed does the boat become rigid.
Other than the mold makers and a couple of supervisors, everyone is minimum wage in the glass shops.
Add on to this that Pearson was pulling several hulls a day from the same molds with the same workers and quality control is not what you would like to think it was ( and these were some of the good boats being made at the time )
Oh yeah, this is in the days before OSHA and the EPA , so respirators are nil and everyone is high as a kite from the fumes ( that's why some of the workers worked so cheap ), could add a little more error?

So 1/16 of an inch is a joke , forgetaboutit !