A couple thoughts for you. # 1 - the EGR valve only operates at lower rpm ranges. At wide open throttle there's no vacuum to open the valve. Just keep that in the back of your mind when thinking on power transition. # 2 - I don't remember "electronic" carbs to much and I am NOT searching for info on how each carb circuit operates because = # 3 - It's a Chevette! It's like half a car!! LOL.. What I remember most about them was it was a coin toss about what was gonna trash first, the cam or the crank! # 4 - If you are having fun - go for it - watch out for vacuum leaks, all those old parts and hoses can be a mine field for vacuum leaks..