The light gray color has been discussed on the 356 Registry at length (and it does look almost white in certain lighting). A match for this gray (besides the paint Stoddard sells) is actually a generic medium gray enamel spray paint sold at Ace hardware under their name. If you search the 356 Registry you can find the actual paint code / part number for the Ace brand paint (pictured below on the fan shroud from my old 356C).
