Well now what?

If the lifters aren't pumping up, I don't think changing the rockers and push rods will help any. Hope I'm wrong and your find a simple solution.
The last time a I ran the car on Saturday after a drive I removed the valve covers and I pushed on all the rockers and all of the lifters were pumped up, I don't know how long an engine has to sit for the oil to bleed down but previously I had some that had not bleed down and some still pumped up after it sat. I hope your wrong too....hahaha. I will find out hopefully by the weekend.