The question of whether to dimension to hidden lines came up a few weeks back and I think the reference given was slightly wrong.
ASME Y14.5M-1994 paragraph 1.4g (not 1.4c)
ASME Y14.5M-1994 paragraph 1.4g (not 1.4c)
... Dimensions should be shown in true profile views and refer to visible outlines. [\quote]
My checker and I were looking for it this morning.