1971 Scamp performance

Have you tried it in 1st gear, more vaccum,from a stop. rear butterflies will open. Wot. 2nd gear 50/50 open . Drive or 3rd gear ,front butterflies are working for cruising. Lent my car to my brother, everything beat him light to light to work. Lol, phones me, l tell him to put it in first and start shifting.His ride home after work was priceless. Lmao.