'70 340 Swinger; Woodgrain or not???

On later models, the "woodgrain" dash and door panel accents were part of the deluxe interior package. The dash panels were bolted to the dash. If you don't have 4-5 holes in the center portion of your dash that you can't account for, you don't have the deluxe interior. (Likewise there will be 4-5 holes on the glove box door.)

Can't say for sure about the 70 models, but I'd expect the same sort of arrangement.