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Yeah, make sure to clean your cam oiling rails very well (we would usually run parts wash through them and then poke at the oiling holes when any particulate gets clogged up in them until they flowed free, then clean the parts wash solution out and re-install). You can also drill out the oil galleys on the head and tap them, that way you can clean them out thoroughly and then install a plug when your done, as sometimes they will get clogged up as well. We used to do that on all the motors in our race program to ensure proper oil flow to the cams/lifters.
Also with the SR its essentially a flat tappet style motor and because of that there is a lot of friction on the cam lobe and rocker surface, in years past when there was a heavier zinc content in the oil you would not run into as much of an issue with wear on those components because the zinc helped keep everything lubricated. Now a days there are stricter regulations on oil contents and zinc has been reduced in many of the off the shelf oils, and thats part of the reason a lot of old flat tappet style motors are running into pre-mature wear issues in the head.
Its pretty well documented within the hot rod community, one solution is to run a zinc additive or an oil with higher content (usually not an off the shelf item)
The cylinder wall issue is another thing entirely though..
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