The problem with using a concrete block is that most guys put nothing under it and nothing on top. When the steel is lowered onto the web or sidewall of the block, it is prone to crack. Part of that is why multiple blocks forming a pier are used under mobile homes. The frame load is spread among the multiple blocks.
If you don't have any steel stands, buy 6 X 6's and cut them into cribbing blocks. Either that, or use at least 4 blocks under every support location.
"Cinder block" is a regional thing. No one in the upper Midwest uses that term. "Concrete" is placed and hardened "cement". "Cement" is a mix in a bag, the stuff rolling around in the truck is "concrete mix". Masonry terminology is easy. Try electrical nomenclature if you need a headache.