I recently picked up a car with a 360 in it. I have never had a 360 motor before and do know they are externally balanced. Question is are the flex plates different between 360 and 340 motors? I know the converters are weighted for the 360. I have a stack of flex plates here and know there is the small hole for 1/4" torq converter bolts and 3/8" hole for some other converter bolts.

The reason I am asking is the car had an issue where 3 bolts backed out of converter where they bolt to the flex plate and was making one hell of a noise. Of course there were several issues I discovered, like bolts too long so someone used washers to take up space, no lock tight, and 1/4" bolts used on a 3/8" hole flex plate. The guy I got the car from showed me his receipt where he just had a new tranny put in and was not a cheap job. Needless to say some real shade tree mechanics was going on.

I want to put it back together correctly and want to use the correct flex plate, so is there any difference?

Thanks