Jacob Wiley and Brady Bagby had 19 points for the NAIA Warriors (13-3).
Eastern never tailed and was up 43-30 at the half behind Harvey's 23 points.
The Warriors came back after falling behind by 20 midway through the second half, shooting 54.5 percent in the second half and finishing 13 of 16 from the foul line. LCSC also outrebounded the Eagles, who shot 54.2 percent for the game, 35-31, led by Wiley's eight.
Harvey now has 191 treys, eight more than Marc Axton drained from 2002-05.