I will go against the flow and say 516s. If you install the bigger valves they flow almost the same as a 906 and you also get more compression and if you get flat top pistons at zero deck you can get some quench that helps HP TQ and MPG.

Over lap does not affect cylinder preasure as much as the late intake closeing point on a long duration cam but it will make it lope more at idle. The whiplash cams are desighned with tight overlap angles or LSA to make them lope and short duration to get the intake valve closed sooner and build cylinder preasure with low compression, they have very fast rates of lift to open the valve faster to the peak flow area of the valve lift.