yes, you need to pull the converter forward off the pump. Make sure the converter is seated all the way back before installing it. Then you pull the converter forward. I would HIGHLY suggest pulling it forward, then turn the motor over and slowly tighten down the bolts. I have seen many a times people pull the converter on one side and tightning down the bolt, then turn it over and tighten as they go. You can get the converter cockeyed sorta stuck. When you fire up that motor and the converter spins, you ruin the converter, input shaft and usually the front pump.
Just remember to pull one side forward, turn the motor 180* and pull the other side forward. Snug down a bolt by hand, then turn it 180* and snut that bolt down by hand. Install the rest and I tighten them using oppiset sides. The same reason you dont tighten lug nuts in a circular pattern, rather a star pattern