You need springs with 1.9's unless you want your stockers to bind and break on you. You wanna get technical, 1.84's are the highest ratio you can run on stock springs.
with rollers you need to run bigger springs with anything over 1.8s. if youre going the roller rocker route and have committed to it then i would definitely go 1.95:1 ratio. otherwise just save yourself some money and get the modded 1.9s.
its not all that difficult. just gotta reach. you probably will get cramps and anoyed from bending over and reaching for so long (damn that dident sound good) i had to take a break or two doing my rockers
as i said, there is alot of debate, some guys use them with no problems, no float on stock springs, others upgrade the springs. I went with L76 springs on mine just to eliminate possible further problems.