There should be a little preload, 030-060. If you look on ebay, etc, you may find a set of the 273 rockers which were adjustable pretty cheap. Or longer pushrods, you need to see how much you need to go. Where in Colorado?
Loveland co. ive watched adjustable rockers set up on utube an they go to where they can spin the push rod or move it then tighten them a half a turn. I know I dont have adjustable rockers but I would think they would be tight against the rocker when the shaft bolts where tightened down. So you think I need longer push rods. I will have to aquire a rod lenght tool, to get the right length. I didnt find anything on rod lenght problems when switching to rhs heads, when I was planning on buying them. So I just reused my stock push rods. the rhs heads shaft mounting point must be taller.
