Nice example of how someone dealt with converter engagement issue using washers. Th400 Torque Converter Bolts
How to install a torque converter in 4l60e and 4l80e transmissions! Plus - where I got the transmission built, choosing a torque Pro Series Torque Converter Bolts for GM Powerglide, TH350 Mr. Gasket 3/8-16 Inch Torque Converter To Flex Plate Bolts 6715 ...