[jmz]

Porsche never used weber 46's on anything but a race car. I don't think you need to start thinking about 46's in street cars until you go over 3.2 litres in displacement even 3.2 litre cars work well with 40's. The car may have higher peak horsepower w/ 46's vs. 40's but driveability will suffer. A low displacement race motor w/ super high compression should benefit by the larger 46mm carbs.