[Chevelle-List] Solid or Hydrolic lifters?

[Bad66Chevelle454]

I took off the intake on my chevelle, because I have pretty much nothing else to check that would be messed up. What Im asking is how would I check them to see if they are bad or not, and how to check if they are solid or not. I noticed if I pushed down on the pushrod, the lifter would press down about a half inch or so. Thanks-

-Tim
1966 Chevelle