Hello Pete, i don't think there is much significance to these numbers as regards the date of production, the production number, from what i know was simply the number of cars produced during a particular shift, so this number would crop up time and time again. The body number, i'm not sure what this number represents, as you say a "matching numbers" car would see this number stamped into various body panels, so was there to aid production
For instance my car is UK supplied RHD car built January 1965 and has the body number 00072, so not a particularly early car
The actual date of production can be found by looking at the VIN or chassis number, if you can post a picture of this we can decipher the date it was built. I assume you don't have a data card, as this will tell you everything you need to know about the car
if you click Technical Manual, above left and then search, body/paint code and VIN, it will explain everything in more detail
I'm sure everyone on here would love to see pictures of your car and follow the restoration process