Welcome! I'm also working on a 29 Cabby along with a 28 RPU, 29 Business Coupe and a 69 Mustang Mach 1 my goal is to finish 1 a year! Do you know the build date of your Cabby?
If your asking about the original build, pretty sure it is later than June 29. And I say that because just having ordered a floor mat from Mac's I learned that post June '29, the E-brake lever is just to the right of the shift lever. And mine is just to the right of the shift lever. The rebuild however was done from a couple of pick up loads of parts in 1984.