George,
Mine's a '33, but if you went with N&N's standard frame mount under floor MC and through the floor pedals you're going to be severely space challenged to add a booster. You can see this real quick by crawling under the driver's side and look at the way the frame x-member is placed - you have to add a booster between the frame mount and the MC, and that's going to require major surgery. This falls into the category of "Ya' shoulda' told Duane you wanted power brakes when you ordered." Adding them now would be a major hassle.