Check the gap between the converter bolt pads and the flexplate. If there is too much space between the two, the converter will be pulled slightly from the tranny and cause pump damage. If more than 3/16ths of an inch, shim up the gap with hardened flat washers and buy slightly longer GRADE 8 bolts.

Another consideration. Remove the paint from the nose of the converter and apply grease to this location. In addition, remove any rust or dirt from the crankshaft hole where the nose of the converter fits into and apply grease there, too. Not doing this can cause the converter to not line up properly and bind when tightening the converter to the flexplate. The flexplate is just that... A flexible plate. It isn't rigid enough to force the converter to line up properly should it bind at the crankshaft floating point. You'll know if this happens immediately upon starting the engine. A severe vibration will be intuitively obvious!