Differences restoring a St.Louis vs. Hamtramck plant?

I know that there were some differences in the assembly procedure / application that varied plant to plant. I know that the under coating was applied a certain way with 1" tape over the holes and other areas masked off. Was there any differences between the two plants with b bodies such as black painted leaf springs vs. natural heat treated ones?

I am in the early stages of starting to freshen up a 69 GTX convertible and would like to get some knowledge on the St. Louis plant before I really dive into this resto.

Thanks,

Brian

I have a 69 charger st Louis built August 68. I will check out the leaf springs for you. Anything else? It is a very low miles unmolested car with great information on how it was done at the factory.all the best Frank

I thought the GTX was in really good unmolested shape? The car will probably tell you what you need to know.

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I thought the GTX was in really good unmolested shape? The car will probably tell you what you need to know.

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In most cases I would agree but in some there are things that you can't take for granted.....example: My '69 GTX (LA-"E" assembly plant) was in pretty much "unmolested" condition but "someone" sprayed most of the undercarraige with black paint. So knowing only how Lynch Road Assembly and St. Louis did '68/'69 B-bodies I was confused as to what to do about that...........I'll wait for the Moparts experts (and I mean that in a positive and good way ) to chime in and you'll see what the OP has a good question because I never knew this