[MAG]

I can't tell the year of the gas tank by looking at the picture. Perhaps someone else can.

"instrument panel that fits the oval speedometer."
Try to put the instrument panel on the gas tank. If it fits it is an early '30 tank. If it doesn't fit it is a late '30/'31 tank.

Looking at the splash apron on picture #2 (right side) appears to be a splash apron which includes the running board. These splash aprons were found on the early "30 cars and phased out in late '30 and the running board was not part of the splash apron as JayJay states. The nose piece of the splash apron was spot welded to the front fender. These splash aprons were not installed on '31 bodies. The later single piece splash apron included the nose piece and was bolted to the front fender.