'39 Chevs came with either a coil sprung front, or a beam axle with two semi-elliptic springs. If it's got the spring hangers at the very front of the frame rails, and back on the rails just forward of the fire wall then it had the beam axle. If it had the coils there should be pockets for the springs or other hangers, on a plain roughly just behind the radiator. Unless the person before you who took off the suspension was planning to put in a MII setup and cut off all the brackets, then you'd just look for the impressions in the rails.