273 rocker arms

All good info guys..tx.My engine is built and i made no modifications to the new stock shafts or rocker arms.A friend told me that i will be sorry and the modifications are necessary so thought i would ask on the forum.
As you know... i try to use logic and question most everything.
Now....who have used stock 273 adjustable rockers with standard shafts and how did they perform for you?
I have dragged the same 273 kit from one stock-cammed 318 engine to the next probably three or four times over the years, since about 1975. BUT
I always slammed the solids onto the old camshafts too. Everything fit, and never had a problem.
They came off a 1965 2bbl engine.
They are currently on my spare engine.