Stock rollers/aftermarket cam

Hey guys,

i just picked up a 91 360 roller block (LA) and it is in running shape from what i have been told. Being that its already a roller block, i would like to keep it roller cam for when i build it up...my question though stems from not knowing much about rollers, so bear with me...would the stock rollers which are hydraulic be able to handle say a 550 liftish cam, give or take a little higher or lower than that? where do you decide that the aftermarket rollers are nesecessary? and can i use the factory spider with aftermarket rollers?

also, just out of curiosity, what is needed to be able to run a solid roller over the hydraulic roller in my block, or is that not enough benefit to warrant switching over

thanks!
Matthew