Finding rockers?

[davidlb512]

What do you look for on roller rockers, besides stud size and ratio, to match them for you car? I want to get a set for my '95 'Bird with the 3.4 V6, and as everyone knows that has the 3.4, it's a pain in the *** to find performance parts for. I know that for an N/A build, you probably wouldn't want to go over 1.6 or 1.65, but has anyone used a 1.7 roller rocker on an N/A with success? If you have non-self aligning rockers, must you replace them with non-self aligning, or can you replace them with self aligning rockers?