273 rocker info please

Guys, what type of issues will i encounter if i use the 273 rockers on my semi stock 340 build?
Will this be a direct bolt in with proper sized pushrods or will i encounter geometry issues, be patient with me please, im learning as i go...Rich
I'd run your stock 340 hydraulic rockers if you are running a hydraulic cam. I lot of work for little or no gain.