Howley did not muck around and quickly stepped Valiant Sun up to 2400m, where he ran third at Bendigo against older horses before running fourth at Caulfield on April 11.
"I thought we'd step up quickly rather than go a mile, mile, 2000 metres," Howley said.
"There weren't enough options and he's a natural stayer, so I thought let's get him out to his comfort zone, and every time we've raised the bar, he's stepped up."
Howley said race shape had counted against Valiant Sun and is hoping for a solidly run 2800m at Flemington on the roomier circuit.
He said should Valiant Sun run well on Saturday there is the possibility the gelding could be Adelaide bound for the Group 1 South Australian Derby (2500m) at Morphettville the following week.
"He'll be entered and if he happened to win, we would consider it," Howley said.
"He could be a horse that could quite easily back-up as we'd do nothing with him.
"He's still quite dumb and doesn't really know what day of the week it is, and the further the better with him.
"I'm looking forward to next year with him when he's a bit more mature and those longer races are going to suit him."