Why cant the torque converter bolts line up on a 1995 gmc 3500 with a 350 engine after switching with the same engine?

If the torque converter bolts on a 1995 GMC 3500 with a 350 engine aren't lining up after an engine swap, it could be due to misalignment of the torque converter or the flexplate. Ensure that the torque converter is fully seated in the transmission and that the flexplate is properly aligned. Additionally, check if the correct torque converter and flexplate combination is being used, as variations in part design may also affect alignment. Lastly, inspect for any obstructions or damaged components that may prevent proper installation.