General information for parts interchange and modification.
I wouldn't recommend the Weber for mpg. I had a stock 3TC with Weber 32/36, headers and 2.25" exhaust, tuned 15-16:1 AFR at cruise. Large tires, roof rack, fully trimmed wagon and got 23-27mpg. I never ran the stock setup, the carb was shot when I got the car.
Ecotec 2.0L LNF powered 82 Corolla Wagon daily driver. 314whp/344TQ