Wilcox,
To determine what needs to done, pull the valve covers and rocker arm shafts.
Thoroughly clean both valve covers, then completely disassemble both rocker arm assemblies. Once thoroughly cleaned drill the oil passages the next size up drill bit, chamfer the orifices and finish with a deburr of the shafts, rocker and pedestals.
Since there is no valve lash in a hydraulic lifter, take care to properly adjusted their preload. If done correctly you will have no ticking. If your push rods or rocker cups are too worn, they will need to be replaced. Last time I did this is less than $40 for all new rockers and pushrods and with 190k, I feel those new parts would be a great and prudent investment. Remember, even with new, opening the passage holes, chamfer and deburr are time we'll spent. I went one step farther and balance the rockers to within 0.10g. Just seemed like the right thing to do.
With everything all clean, an oil change sounds like another prudent move .)
In regards to oil, I bought both my 87's used and switched 1st oil change to 10w40 full synthetic and have never used anything different for Pacific Northwest, California or Arizona climates.