I don't know big blocks much , but my small block with a mild hydraulic ( .480 lift and 238 @ .050 ) and decent springs punched a push rod through the rocker.
You don't need adjustability , but durability could be an issue.
There are H.D. stamped rockers out there , and this might be a nice choice for you.
I couldn't see forking out for T&D's , but an upgrade would not be a bad idea.