There are 2 sizes, smaller was used on 340, 383 and non-hp 440. 440 hp used the bigger AVS, and it has bigger primary bores. The secondary side is the same size between the two. You obviously can't turn a small one into a big one, but playing with the jets and metering rods, you can fatten up either one.

Scott B. "I'm a self-made man... I started with nothing, and I still have most of it!" 68 360 rusty B'cuda 'vert (GO Fish)13.59@ 98.72 mph 69 340 GTS stock 14.18@ 95.60 mph 01 5.9L Ram 1500 Quad Cab 4x4 01 3.5L 300M 16.23@ 86.97 mph