Flat dash and lower screen is from that timeframe . Those ribs look like someones later attempt at strengthening.
Are the ribs stamped into the sheet metal or welded onto the back of it. If welded on, it is probably added on by someone to strength it.
Ribs are added. Cowl from that angle could be anywhere from '15 to early '22 Dodge Brothers. The rear section looks fabbed from scratch. Dave