Procomp Holley type carbs

3 circuit 950, 4150 flange, 2circuit blocks. The feed tube for the 3rd circuit is higher, because they pull the fuel from the idle well. You simply take a paper punch and punch a hole in the 2 circuit gasket for fuel to get to the feed tube. My 358" is a little mild to get a real good picture of how the timing worked with the tube higher like that. Also, not much venturi in that 950.