Thank you, thank you, THANK YOU for deciding to change the color on your car. I wish I could UN-see it, but I can't. It's burned indelibly in my eyes. YUCH!! Either a former owner was color blind or was just plain lacking in taste. The present color is a distant and poor relation to the 1929 Balsam Green. Not my favorite shade of green, but far better than what was brush-painted on your car.
Since you have decided to get away from green (Have I forgotten to thank you for that on behalf of the entire Model A community?

), there were some nice color combinations for the 1929 Model A's to choose from. As recommended in a previous post, the Thorne Brown and Seal Brown combination with an orange pinstripe is VERY complimentary on a Special Coupe with its extended black top material to the belt line. The colors work well together (see attached photo borrowed from the Internet; owner unknown). You will be a happy camper going with that color scheme. I painted my 1929 Murray Town Sedan these colors and am very happy with the look. PLEASE keep the wheels gloss black as they came from the factory and resist the temptation to paint them orange to please modern "taste" in colors.
You are planning on sanding or stripping off all the old paint down to bare metal, aren't you? If you don't, that barn paint will crack underneath the new paint or lift up from underneath. Even using a catalyzed sealer won't un-do the damaging effects of painting over house paint on a car.
Marshall