Longer that stock length valves would be nice.  This allows some additional flexibility in port design and when using higher lift camshafts.  Drawback is that the supports in the heads for the rocker stands will have to be higher to maintain proper rocker arm geometry.  This then makes the valve cover rail higher and in turn and the valve cover sits higher.  Is this a problem for those of you with a power brake booster?

Raising the rockers would also dictate longer pushrods.  Instruction sheet could include a recommended length for a starting point but this is something that might be varied depending upon the brand of rocker, deck or head milling, etc

Feel free to add thoughts.

Lorena, Texas (South of Waco)