How far are you going to push/pull in your usage?
I've done quite a bit of that and the problem really is combination of exposure and development both. You can easily get really dense negatives but they are printable - they just look really dense. In every day use, I rarely do more than 25% from published figures and that includes one stop push and pull. I usually do either EI400 and -10% or EI200 and -20 to -25%` depending on lighting condition.
I use D-76 by the way.