State Of Play, a best-priced 20-1 with William Hill , will be Evans's first runner in the National and looks very well handicapped on his best form.
After a five-month break, the nine-year-old began the current campaign with victory over Ollie Magern in the Charlie Hall Chase at Wetherby and returned to the Yorkshire track on Boxing Day to finish fourth to Nozic, Tidal Bay and Cloudy Lane in the Rowland Meyrick Handicap Chase.
State Of Play has not run since, but the Vale of Glamorgan trainer said: "All his best form is after a long break, so that has always been the plan. He's just such a different horse to train when he's fresh. It's like training a different animal when he's had a nice break.
"He's very happy in himself and, though you never know quite how they will take to the fences, it is nice that he's won at Aintree previously, albeit around the Mildmay track. He seems to appreciate big, flat, left-handed tracks.
Though a former point-to-point champion trainer and jockey, Williams never had much luck over the big fences at the Liverpool track and admitted: "I had a few spins round there in the Foxhunters' Chase, but I was absolutely useless.
"I got round once, but I was absolutely shocking - the world's worst advertisement for riding Aintree. It's an understatement to say I can understand the difficulties in getting round!"
Williams, who turns 38 on Friday, is hoping that State of Play can provide the perfect gift.
He said: "I was born on Grand National day the year Specify won. It's funny, my father always tells the story that he backed Specify and he told all the nurses to back Specify as well and he got them all drunk on champagne when it won.
"It's been Grand National, Grand National since the day I was born, so it's got to be a race I want to win."
