I got my heads about 2-3 years ago also. I actually have a hydraulic cam, but it's those tricked-out Schubeck/Smith lifters that are popular in Stock class racing. Composite puck and about .015-.020 plunger travel. I shift & go through around 68 in the 1/4. The valves I got through Comp Cams were something like 5.01" (No longer available.) and I think it was +.050" valve locks that I got a little more height with. Pressures are suppose to be around 170 closed/370 open, but I haven't double-checked the heights or pressures after getting them back from the shop. (I got these heads approved for IHRA crate motors because they allowed R/T Magnums years before but nothing for LA engines.)
Gotta watch the rocker geometry, especially if you go with longer valves.
If you find beehive springs with the pressures needed, they provide plenty of rocker clearance. I use to clearance Crane ductile iron rockers with regular springs before they allowed roller rockers in Stock on my OEM heads. Swapping in these same springs eliminated that problem there as well.