You can adjust half of them at cylinder 1 TDC and the other half at cylinder 6 TDC I believe. Yoy need to check to see if the setting is for warm or cold. They will typically be a couple of mils different.

High quality roller rockers work fine with solid cams. What else would you use?! One could probably find some crappy ones that ain't any good; there seems to be a lot to choose from these days. I can vouch for the Crane gold aluminum and Crower forged stainless.

Good luck, Kitz