240SX auto torque converter lining up to flex plate

[RM12577]

Hey guys, I just got an S14 with the motor pulled out, its an auto as well. I had a replacement engine to put into it and got it installed but I didn't think to try to line up the flex plate with the torque converter while installing because it was hard enough just getting the engine lined up with the transmission. So now I have to line the flex plate up with the 4 bolts on the torque converter but I cant figure out how to keep the converter from spinning when I turn the crank. anybody done this before and have tips, I really don't want to have to take the motor back out, I am currently borrowing a car until I get this one together.

Thanks,Carl