The lightly-raced four-year-old has won his last two starts in the style of an improving stayer, but he has not run since mid-August with the aim of protecting his handicap mark.
"We're on countdown to Saturday, everything has gone well so far, touch wood," said Northumberland-based McLintock.
"He's got a mark of 90 and I didn't want to run him again and pick up a penalty as I'd like to think he'll be competitive off that.
"I'm getting quite nervous but it's a nervous excitement, this is a big chance for us. We're very lucky to have a horse like him.
"I bought him at the sales and Paul and Clare (Rooney) bought him off me to stay in the yard. He looks a good buy at £5,500 now.
"I've also got a two-year-old for the Rooneys.
"We were thinking of going hurdling with him, but when he won the Colwick Cup at Nottingham, Jason Maguire (Rooney's racing manager) said he didn't think he'd be seeing a hurdle for a little while yet!
"The dream is he's a Cup horse for next year."
The former Aidan O'Brien inmate improved out of all recognition in his last two starts over timber, winning the Swinton Hurdle and defying a 16lb higher mark in a valuable race at Market Rasen.
He now switches back to the Flat for the first time since he left O'Brien at the end of 2014 and is a general 8-1 favourite to make a victorious return.
Williams told Betfred TV: "I think a lot has happened in the last 12 months for him. He's been castrated (gelded) and he's had a full season running over hurdles in the middle of the winter, which obviously didn't suit him.
"Then the sunshine arrived during the spring and that is all I can put it down to. We had glorious sunshine, which is not always the case in Wales, and he just thrived. He's improved every month since then.
"There's no doubt he's going the right way over hurdles, so you're always happy to have a go at a big pot with a horse in form.
"It would be a fantastic race to win and, to be fair, it's more of a jumping race than it ever is a Flat race and it's always nice to try to compete with the best in any division of the sport."