i think its blowed

okay guys i need a little help i went to the huntsville dragway show and go for the tennesse valley mopar club yesterday and i bought some stuff, one of which is a set of 1.5 comp roller rockers. can someone explain to me the diffrence in 1.5 and 1.6 ratios? and what the ratio even is ?will this increase the lift of my cam over stock rockers? and if so how much? what do i need to set the lash at on these rockers? and will i have any problems with my cam i already have? i have never really done a whole lot of research on how ajustible rockers effect the geometry of your valve train so i guess i am needing a crash course on this type of thing any help is greatly appriceated