Yes, I like to use good grade 8 hardware. I think thread pitch is 8mmx1.25 and I go probably 1" or 1 1/4" long. Just make sure you tighten the bolt down, that's when it is the strongest. I'll put a picture below that shows how I lifted mine, I only did the engine but you can use the same concept for the whole package. Now when it comes to getting that converter off, you might be able to unbolt all the rods from the crank and push the pistons up in the cylinders, or beat them in with a hammer if they are seized. Then try to turn the crank, or unbolt the main caps and then try to turn the crank. Any way you go about this, something is getting damaged and if you want to save the converter then something in the engine will get damaged. Not like that matters much though, its frozed up lol.
Kind of hard to see, but I have it bolted at the front and back. If I was pulling the whole package I would bolt at the 4 corners on the heads.