Great news! I get inquiries about the pickall shrouds (both models) all the time! Including from greg!
And as a further point of information...I have confirmed that the "deep" shrouds for the '74>'75 pickalls equipped with the amc 401 motor are the same as the shroud used with the 392-powered rigs. These would be the trucks with the "set-back" engine location.
And keep in mind...some "late" model year 1973 pickalls are also equipped with the amc 401 in the set-back location. So the '74>'75 model year designation for the revised engine location (and engine application) is a moving target. In fact, lyle has a '73 t'all with the set-back 401 motor.