At my son's D3, which is a very competitive D3 school run more like a D2 than a typical D3 mid seventies would get your no attention whatsoever. Guys with control and movement throwing in the low to mid 80's were mostly consigned to the JV team freshman year, given a year to show improvement and ruthlessly cut if they did not. Over the last three years the varsity has had guys throwing in the upper 80's and a few in the 90's consistently. In his league of 9 schools probably only 1 of the 9 would give a guy with the profile you describe a second look.
But as somebody said above D3 covers a very wide range.