THE SETUP A street hustler (Eddie Murphy) switches lifestyles with a Wall Street yuppie (Dan Aykroyd).
VINTAGE EDDIE Murphy's Billy Ray insists to the cops he's a blind, legless Vietnam vet: ''I was in Sang Bang, Dang Gong — I was all over that place.... I was Agent Orange.''
WORTHY EXTRAS? Yes, if only for the one archival promo clip that shows Murphy and Aykroyd, both in their prime, doing dueling old-Jewish-man impressions. A-
