There's no need to pull the tranny. Since it's in the truck, it's easier to work with it rather than pull it - no problem at all - just jack up the front of the tranny a little for a better mating angle. After you get a few bolts in, let it back down so you can bolt up the engine mounts. Then you can install the upper bellhousing bolts. You'll figure it out as you go.

Remove the radiator so it doesn't get damaged.

Don't forget to install the plenum support and cable clamp on the rear of the driver side head before you put the engine in the truck.

Frank