Chris ,
A lot depends on the type of rocker and valve cover gasket used. For instance I used a Crower stainless with .775 actual lift at the retainer with lash and had no clearance issues. You could also use the Felpro steel laminated gasket for a little more room.
The breather tubes in the bookmarked section are too low on the cover itself. The original '70/71 breathers were centered on the cover. and a small cover was welded on the inside to inhibit oil from blowing out.
Forrest , I might be talked out of my T/A covers. PM me if you don't want to go through modifying stockers.
Randy