idle mix screw sound a little lean to me 22 degrees timing at idle wit 11:1 comp is about right timing tab is not off for that matter if you have about 14 more in mechanical you alright unless u also have vacumm to go with the mechanical u could have another 14 degress there then whoa those two 14 degrees are for engine that have less comp and can handle less base timing!! this as been all my experience with my 11:1 406