Brent,
Your cam specs sound a lot like mine. I have an Isky with .535 lift and 240@.050, .022 hot lash. I also have the Isky solid lifters which do look like hydraulics complete with the retaining clip. I don't recall whether or not they had an
oil hole on the side. But, like you, when I first saw them I said to myself "these are the wrong lifters - they sent me hydraulics." Upon closer inspection, like Tom said, I was able to confirm that the pushrod cup was affixed solidly in the lifter body and there was no movable plunger.
Chris