73H is 737-800.

The best option for domestic J is if you can score one of the international config 767-300's with 1x2x2 up front. But there is no way to know what type of 767 is going to be operating anyt particular flight without some inside knowledge.

And remember that QF does not pre-allocate seating on domestic flights. So make sure your booking notes you OneWorld FF details and that your seating preference in correctly reflected in you membership details. The computer system them does the seat allocated about 24 hours out based on FF status and seating preference.