The pair teamed up to win the Classic Chase at Warwick last time out and Milansbar is one of 21 entries for the marathon at Gosforth Park.
Back up in the weights after a spell in the doldrums, King feels everything is in place for another big run.
"Four miles and heavy ground should be perfect, the race looks tailor-made for him," said King.
"He's been second in a Midlands National so we know he stays the trip perfectly well.
"We hope Bryony will be available to ride again as she can take 3lb off.
"The season she is having, she's on the crest of a wave and her confidence is so high, she just keeps rolling on. Horses simply jump and gallop for her."
Chase The Spud has been left at the head of the weights following the withdrawal of Vicente.
Houblon Des Obeaux and Emperor's Choice are in for Venetia Williams, while Sue Smith could run Hainan and Smooth Stepper.
Harry Whittington's Vinnie Lewis and David Pipe's Daklondike are two young stayers on the up, with Knockanrawley and West Of The Edge in the mix as well.
Irish hopes rest with Adrian Keatley's Thebarrowman and Pat Griffin's Portrait King.
Former winner Milborough is also engaged.
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