First thing you need to do is determine whether it is a Penn Yan or not - the serial number you posted, FX 49138, is certainly consistent with Penn Yan. In this case, as Benson described in a different post, the FX would indicate a Carry Canoe, 15' x 33" x 11-1/2" in dimension. Penn Yan records for their wood canoes and boats were reputedly destroyed when they switched over to fiberglass production, but it would be believed that this was number 138 of 1949. I've attached the 1949 catalog page describing this model below.
Now, the reason that we need to look at your identification a little closer is that the photos you posted previously show it had at one time a shoe keel. A shoe keel is wide (about 3") and thin (about 1/4"), and fastened with screws that are staggered across the centerline of the hull. I am not aware that Penn Yan, or any other U.S. builder used shoe keels - this is pretty much a feature of Canadian-built boats.
In addition to the catalog page, I've posted images of another Penn Yan Carry Canoe. You can compare this with yours to see if it is similar. Note that according to the 1949 catalog, the fancy yoke has been dropped in favor of a simpler shaped bar thwart.
Its a start anyway...
Cheers,
Dan