All Small Six 170 hydraulic lifter retrofit

This relates to all small sixes
How can you tell if a 1964 170 cu. In. Engine can be retrofitted with hydraulic (non oiling) lifter/cam from Clay Smith. I put my finger in the lifter bore and there is a hole, which I’m assuming is the oil galley? And that would mean a yes for using the the “Non-Oiling” hydraulic lifters from Clay Smith?
I can’t believe this is not a more well documented issue. Been looking, calling and asking all day?!?!
Sheesh….
 
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