Stewart is not the only concern for the Colonials, who last season went 9-2 and won the Suburban One League American Conference title with a 7-0 mark.
"The scary part is that they have a bunch of guys who are very dangerous with the ball," Chang said.
The Vikings' spread attack also features running back Mark Bonomo and wide receivers Clay Domine and Dakota Clanagan.
Here is a closer look at the 7 p.m. contest.
Last year. Totaling more than 300 yards on the ground, PW triumphed, 20-14, in Collegeville.
Top prospect. Stewart, projected to play safety in college, has scholarship offers from Boston College, Pittsburgh, Rutgers, and Syracuse, among others. "He's very athletic, has outstanding instincts," Perk Valley coach Scott Reed said.
Big losses. The Colonials lost 1,000-yard running backs Corey Kelly and Terry Brown to graduation. They combined for 2,628 rushing yards and 30 touchdowns last year.
Solid rusher. The 5-7, 170-pound Bonomo last season carried 134 times for 941 yards and four TDs.
Rising lineman. PW's Ryan Bischoff, a 6-5, 285-pound junior offensive tackle and defensive end, has drawn interest from Maryland, Penn State, and Rutgers.
Main target. Stewart and Domine, a 6-3, 195-pound senior, last season connected 55 times for 879 yards and five touchdowns.
Catalysts. The spark plugs in the Colonials' option scheme are QB Connor Hanlon, fullback Jose Mora-Vega, halfback Brian Afflick, wingback Ray Clarkson, and wide receiver Jim Rodgers.
Up front. Leading the way for Stewart and company are tackle Austin Gansz (6-0, 215), center Seth Jonassen (6-3, 250), and guard Tom Jaworski (5-10, 200).
Eyes on Stewart. PW is counting on strong defensive efforts from Bischoff and fellow end Jack Mailey, tackle Steve Kovacic, linebackers Mora-Vega and Anthony Picard, and safety Nafeese Nasir.
Analysis. The Colonials are largely inexperienced. That spells trouble against a Stewart-led, potentially explosive offense.
Pick. Perk Valley, 26-14.