Unless you want vibration and other problems like premature thrust bearing wear you MUST check it.
0.0080 of runout is unacceptable. 0.0050 or less, the closer to zero the better it shifts. You also need to check for the trans mounting flange to be square with the engine. You should torque every fastener before checking the runout and repeating the process to ensure the measurements repeat. I would suggest using studs rather than bolts.