The reason fuel inlet is on the driver side is that is the only bowl that will fit the carb spacing using the regular metering blocks in the rear. One advantage, as mentioned, you can change the jets in the outboards. These were marketed as an over the counter carb or ones that you could get from Holley. The mechanical secondaries do give you a big kick when you get into them. I had a set on a race car and they ran great in testing around on the street. On a race cars with slicks and a sticky track, I had a bad bog. I never could spend the time to try and work that out. I went back to the oem vacuum secondaries and started playing with the springs. It went much faster and consistent without the bog. I figured if the stockers and super stockers could run as fast as they were with vacuum secondaries, I could be satisfied with oem as well.