Engine Test Stand using K member?

A friend and his son helped me out with this US Cartool replica. I have to say, there was an oversight. I was hoping that this dolly could be something that could have the engine/trans/suspension installed by lowering the body over it but nope. The way the k-frame rests on the dolly is that there are two studs that go through the two front k-frame bolt locations. If the k-frame was supported in a way that did not use the bolt holes it could work.
There's no reason this dolly couldn't be used as a run stand.
If I used my k frame I would have to be able to lift the engine, k frame and tranny as a unit and drop it on a cart to roll under the car for installation. I know some of the k frame carts are too high making it tough to slide under a car unless its on a 2 post lift. All I am accomplishing with this idea is the elimination of motor mount support fabrication which would take a bit of work. I've got enough to do.