I don't usually post on these older threads except I have something to add. I got 2 smog pump assm with brackets, diverters & clamps form Jon Mello a year or so back. 1 pump is dated 03981Y (39th day of 1968). It has a 24765 diverter valve & clamps are dated 4/67. The other is dated 05281Y (52nd day of 1968). It has a 28469 Diverter & clamps are dated 1/68. Both of these look like they've never messed with. Both pumps have the valve in the body of the smog pump & are still attached to the small block intake brackets. I'm trying to see what might be best for my 3/13/68 Z/28 is why I have them out now.....Joe