[huntaaar]

i have successfully installed the holley 500 two barrel on my 305e but am having trouble jetting it properly. first i tried #72s and it was to rich(fouled the plugs) then i tried #63s and it was too lean(surged after take off) i currently have #66s and the plugs are honey brown like they're supposed to be. the thing is, the exhaust still smells rich. i just adjusted the lifters and tried every combo of idle mixture but it still smells rich and fuel economy is poor (10mpg). I this a poor carb choice? could it be my timing? is this normal? Any insight on this matter would be greatly appreciated. thank you.