I like to throw together a wood skid that the engine sits down into, keeping it upright. Then strap it down to prevent sliding around when that jerk pulls out in front of you, and you have to slam on the brakes.....Been there and had it happen. Just for reference a 727 Chrysler transmission tail shaft puts a perfect hole in the front of a Chevy 2500 bed when only held in place by a load bar and gravity.

The steel skid plate a fixed to the oil pan will give the engine a steady base, then strap it down to keep it secure, but I do not know for sure if the later 134 engines still have the skid plate like the earlier models did. Just use more straps then you think you may need.