[Mr70]

No way to tell what Brand tire the car came with originally from your buildsheet.But in box #93,it states a Tread Stencil code.I have seen L8DS on Firestone & Goodyears.I'm sure other brands must have used this tread stencil,so I doubt that was exclusive to those two brands.
L8DM I've see used on Goodyears also.
General 700's are what I would REALLY like to see.One would need to find some NOS or an ORIGLS6....

Let's face it,Tires & Batteries were probably the first items replaced on a new car due to wear.
There's just not enough Survivor Cars or unused original Tires to refer to.