Some claim to have to have replaced the seal by lowering the crank, but this isn't the proper method . There isn't enough room to get a new rope " rolled" into its slot correctly. It all sounds like a bodge.
I replaced the rope seal in my C8 216 using the method described in my previous post, and it has never leaked. It's the type of job that needs to be done correctly the 'first time.' You don't want to to be pulling the engine apart again to fix a rear main oil leak.
https://www.jalopyjournal.com/forum/...cement.176292/