The results of the BUN test will be contaminated if the patient is consuming certain drugs that cause problems with the blood sample. Before the BUN test, the patient should make the doctor aware of what medications are being consumed.
Vega body styles were used for several badge engineered variants. The 1973 to 1977 Pontiac Astre had Vega bodies (and Vega engines through 1976). The 1978 to 1979 Chevrolet Monza and Pontiac Sunbird wagons used the Vega Kammback wagon body with engines by Pontiac and Buick.
It had a 305 V8 and looked very similar to THIS (http://www.wktechnical.ca/acadian/1980_monza_spyder.jpg). It was the Spyder model, but it was not a convertible. My first car!!! Bought it my senior year of HS 1980, it was a 79 model with 15k miles, blue with light gray interior. 305 V8, dual exhaust, bucket seats, center console, hatchback.