Ebreach,
In your post you said "what color it originally is supposed to be". Did you mean: 1) Which color combination was it painted when it came off the assembly line, or 2) What were the color combinations available for the '30 Town Sedan.
If your looking for #1, then the above posts have good places for you to check.
If you are lloking for #2, The MAFCA book "Model A Ford Paint & Finish Guide" has tons of painting info. Here is a list from the book.
Lower/reveals Upper Pinstripe
Copra Drab Chicle Drab Straw
Chicle Drab Copra Dra Straw
Kewanee Green Elkpointe Green Apple Green
Ford Maroon Black Vermilion
Black Black Vermilion or Apple Green
Brewster Green Black Apple Green
If you Google "Model A Ford paint codes" I think one of the hits will be "Goldcoastmodela", they have a list of codes. If you are NOT building a "Points Car" then these colors should be as close as you are going to get with todays modern paints.
Check LaBarron Bonney (sp), they will send you a sample set of the fabrics for your year and model.
Ed