Well, I DID beat a couple of slant 6 pushrods out straight with a hammer on a vise years ago. Put um back in, adjusted the valves and it ran great until I did the V8 swap.
I've bent some in my 383. My Mopar racer bud Tommy told me to just roll them across a straight/ flat piece of concrete, tap em with a hammer where you need to, and then double check them on the mirror he said the glass should be nice and flat...