Jeff,
If I am understanding correctly, you want to provide angle bars to allow you to locate parts at some angle other than square to your table & head. Is that correct?
If so, why not make it a bit more universal? A set of angle plates that are (say) 6 inches on the base ought to be of more use to you around your shop. The attached Angle_Plate_Doc.pdf shows the approach I often use around my shop. This way, should you need (say) a 33.7° index, you could add one to your set. A 6 inches for your 5 inch tombstone block, a dowel pin slip-fit through the "tall end" .3755 inches in gives you an automatic index for the plate.