I had a 49 ford with a V8 flat head and one wiper, anytime you let off the gas you were running blind. I am sticking with one wiper on the 37 since I will be running vacuum. If I am reading the master parts book correctly the dual wiper used one motor with links to two rods to each side transmission, it shows 35 to 54 2nd design. But the motors part numbers changed almost every year except between 37-38,42-48 and 49-52. No expert only going by the book.
