Great I’ve got two low smog ones I’m going to set up for the future 408. Neither one has the smog tube on on the lid and have ported vacuum for the advance. I haven’t looked them up but I think they are pre lean burn. Does that sound right?
I don't know. I'd have to see them or see the number. The ported vacuum was not for the vacuum signal on the thermoquad. It was for the EGR valve, so those may be smog carburetors.