Going Roller on my 340!! Solid or Hydraulic??? Pro's and Con's
What are you looking to make for power?
I think for roller you're going to want to at least check out the MRL Performance lifters.
www.mrlperformance.com . I'm not sure that with those you actually need to modify the lifter bores/oiling.
He built my engine, I have a pretty basic 9.7:1 340 with a hydraulic roller cam and basically stock edelbrock heads and it made 470hp.