Yep, this is my '50 and I know the firewall is the original paint.
The city painted it red outside because they were using it for
their fire truck:
http://www.pbase.com/dennygraham/image/116588172 All of the original ones I've seen had the rubber drain painted
so it obvously was installed when it went to paint. I touched
the '54 for more than a year and haven't really done any cleaning
so I don't know what's under all that dust and dirt.
DG