Hunslet are top of Co-operative Championship One, and racked up a 58-10 win at Swinton last week.
March said: "Good teams are ruthless. They make sure they put on a good score when they do get out in front, and that's what we managed to do at the weekend.
"There have been times earlier in the season when we haven't done that, so it's pleasing to know that we've learned that lesson."
He added: "York will provide a big test for us this week, but we have a lot of ex-Knights players who'll be wanting to prove a point."
Adam Sullivan and Dave Clayton return to March's line-up, while York playmaker Chris Thorman returns to action after missing last week's win against Doncaster.
The Dons themselves need to win four out of their last five matches, starting tomorrow at home to Blackpool Panthers, to gatecrash the Championship One play-offs.
Kyle Kesik could return to the Doncaster line-up, while loan signing Ben Jones is in line for his home debut.
In the Championship, Sheffield Eagles could be boosted by the return of Dane McDonald (shoulder) for tonight's trip to Toulouse Olympique.
Simon Brown could play after joining from Doncaster.
Said Tamghart (knee) and Sean Penkywicz (shoulder) are doubtful for Halifax, who can strengthen their place in the top four of the Championship with victory over Whitehaven.
Mark Gleeson is also ruled out for the rest of the season, while Halifax will assess Graham Holroyd, Ben Black and James Haley before finalising their squad.
Dewsbury Rams coach Warren Jowitt says his side must improve their finishing if they are to trouble Widnes Vikings.
Dewsbury lost 36-12 against Toulouse on Saturday, but Jowitt insists his side should have won.
He said: "We outplayed Toulouse and the tries they scored were nothing tries. They weren't well-worked tries. We had four knock-ons over the try line and we bombed four other chances from clear breaks with dropped balls.
"Anybody that was there would agree that we dominated the game, even though the scoreline doesn't suggest that."
Injury-ravaged Batley are likely to be without Paul Handforth (thigh) and Gareth Moore (shoulder) for tomorrow's visit of Barrow Raiders, leaving the Bulldogs with few options to cover his half-back positions.