(8th Cir.), denied, t hahan., 423 U.S. 893, 96 S.CL 191, 48 LEd2d 124 (1975). This standard also applies In cases where the conviction rests on Itumstantial evidence, see United State/ Joyner, 639 F.2d 1162, 1166 (8th Cir.), denied, 429 (1976); United States Shahan., supra at U.S. 988, 97 S.CL 41 5