Mike is right about the possibility of something being amiss, but I'd also say that if it can be checked out before buying, it would be a really good thing to snag.
All you have to do to use solid lifers is block the
oil passages and use main bearings meant for the purpose.
Mine (pictured in my gallery) is that exact block and it was fine. Went to .030 over and had no problems. I also used a solid lifter cam.
Al