Is this a running engine that you're thinking of changing? (and if so, what cam is in it now?) or a fresh build?
If you've got power brakes you can't go too rowdy on the cam without messing them up (or having to either add a hydroboost system or a vacuum pump). Overlap is what kills vacuum. The hydraulic roller you've listed sounds pretty safe with those .050 duration figures and the 112 LSA, also the fact that it's a roller profile helps keep overlap down. If it helps, I'm running a solid roller in my car, 236/242 @ .050 on a 110 LSA, and I'm running hydroboost brakes. You'd probably be relatively safe in the "range" between what you're thinking and what I'm running.