ok so I am sure that someone, somewhere might have done this I cannot say that I would suggest it. The blocks are drilled from the back through to the front with a drilling process. Not something the average machine shop has the tooling for. In the past when I have encountered an Indy block with no lifter oiling I have sent them back to Indy for that process (only once). Unless the block was ordered with lifter oiling, they do not have or need it, UNLESS you are running a Hyd or Hyd Roller. I have seen people build a manifold system inside the lifter valley to each lifter but that is complicated to say the least.
Todd