D4B DC mods like the LD340 DC mods?

The notch is cut in to use a thermoquad carburetor. Any way what you are doing is changing it from a dual plane to a single plane, sort of. If your not using a thermoquad carburetor, I wouldn’t do it. I’d use a larger carburetor than an AVS with a dual plane as 4 cylinders only see 1/2 the cfm and the AVS is a small carburetor.