1) You should see evidence of undercoating on the bottom of car if it was undercoated from the factory.

1a) Bottom of car should be gray primer color with primary color overspray on bottom. Hopefully someone will post a few photos for you.

2) Bottom of hood is body color.

3) Mopar did not use speckle paint for trunks on 1970 e bodies. Your trunk will be body color.

Joe