So ive heard roller rockers can give ya a bit more power are they worth the dollar to power gain ? And how do i know which ones to get are certain ones better then others and which one would fit my 350 sbc its a crate engine years to fit 1965-1975 this is my first chevy engine so im not sure what to buy .

And is it possiable to buy them with more lift say on the exhaust only i guess that is the size or something like 1.5 to 1.6 ?

Jason blownSBC 350 datsun