The 19-year-old opened the scoring from the spot in the first half before twice drawing United level after the break with spectacular long-range finishes.
Stamford's goals were scored by Niall Mather, Ryan Robbins and Delroy Gordon.
Boston (3-4-1-2): Christian Dibble; Trialist, Joe Maguire, Courtney Wildin (Herve Pepe-Ngoma 8); Marcus Marshall, Grant Roberts (Cameron Johnson 73), Josh Green (Courtney Wildin 46); Jason St Juste; Callum Chippendale; Waide Fairhurst (Liam Adams 53), Lamin Colley. Sub (not used): Michael Emery (gk).
Referee: Alistair Wilson.
Attendance: 329.