Looking to do a simple roller rocker install on my 496 mag HO,

is it as simple as replacing the studs and installing the rockers?

Fit under the stock covers after the drippers are removed?

Answer to your questions:
Nope,
There are no drippers
No,

Unless you are re-doing the engine for higher rpm and much bigger camshaft usage the roller rockers will not add any power or reliability and the conversion on the 496 (8.1L) becomes expensive about $450 and not worth any performance on a stock engine.

"If if ain't broke, don't fix it !"

Regards,
Ray

Know that a rocker change will hot make a huge change but have the rockers now from an old project.

Ray do the 1.8's help at all? The added lift is ok with stock springs and VP room?