Should I buy a 2008 LR3 with 90,000mi that had the short block replaced at 46k?

What is your question?

I'm about to buy a land rover LR3 with 90,000 miles on it. The carfax shows that the short block was replaced at 46,000 miles. How concerning is this? Also, it shows "air suspension checked" quite a few times. I am having a dealer check it out before I buy, but should I even bother?