All OE AVS's are lean from the discombobulated emission requirements of that era (68-71) when Ma & the rest of em were trying to keep up with the strict federally mandated emission stds. convert the tall pri jets/3 step rods to eddy performer short pri jets/2 step rods. a few thou richer on cruise/power might be a good start. AVS strip kits are as rare as can be. EDIT An AFB is a far better carb to work with (if you have a choice).