I seem to recall that my 250 is .030 over and I'm using the stock jetting on my 1403. I tried all sorts of different jets thinking I needed to lean it down only to come to the conclusion that the stock jetting works the best by far. I've got Clifford intake and dual exhaust. Hope that helps.


1968 Camaro - 250 (No, I'm not gonna drop a 350 in it!....Jeez!)
1968 C-10 with 2 extra cylinders