Lobe separation alone does not determine overlap/manifold vacuum. The total duration is the other factor. A cam with 260 degrees of duration and a 112 degree LDA has less overlap/more vacuum than a 270 degree cam with same 112 degree LDA.

 

yellowjeep what are the specs on the lunati cam u have in your pickup? was there any special modifications u had to do to the pushrods, rocker arms or valvesprings to make it work correctly with stock components