We found this Autolite 4100 on top of Art's Hi-Po engine. It has the hot-idle compensator, which makes it incorrect for a Hi-Po application. It does, however, have the manual choke. It also has the larger 1.12-inch venturis and 191/416-inch throttle bores, making it 600 cfm. From a correctness standpoint, it isn't the right carburetor for a Hi-Po.