Just be careful,and remember even grade 8 bolts 3/8" thick can bend if you let the transmission "hang" from them,you want them to just be guides,not weight bearing--letting it sag or shoving it around with too much force could crack the ears off the bell housing....so a floor jack that adapter will work with is pretty much a must..
My transmission adapter also wasn't able to be "tilted" simply by turning the knobs on the threaded "tilter" device,I had to push up on the transfer case or transmission a little to get the load off the thing ,then I could turn the knob--not a fun job alone lying on your back,but it was the only way I could get it to tilt ...
Shoving the transmission back in was the hardest part,I had to lie under the truck with my head touching the rear diff and use both legs to try and shove it forward evenly,while grabbing the frame rails with my hands--after I got it close to the engine I had to resort to kicking it to get it all the was flush with the engine block & dowel pins....and I had to keep adjusting the "tilt" and height on the jack to keep the transmission and transfer case from going crooked..
There are other ways of doing it too--if you have an engine crane and a removeable "tunnel" you can use the crane to hold the tranny up and use a ratchet strap or come-a-long to pull it back far enough to get at the flex plate bolts..the legs on the crane are right in the way underneath though,to make it more difficult...neither way is "easy"unfortunately..
