Do not use normal cement blocks to support cars. I am chicken in sliding under a car unless two support systems are present. Solid concrete blocks might do for one of them. Just not the webbed ones. This has been warned about for a very long time. They are not really strong by design of the concrete mix. In a way even designed to break fairly easy so you can fit them in.

You do not want to land up like all the past wives of Orson Wells. The old entertainer. Famous for his war of the worlds broadcast in the late 1930s. He was about four hundred plus pounds.

All his past wives had something in common to complain about. After being married to him they all were flat.

I have lost muscle mass at my age but I moved a 114 automatic transmission reciently. As mentioned not that heavy but you will want a low profile transmission jack. You just do not have good leverage positions while under there.