I have a 1969 428 4 bolt main at engine builder for the last 12 months. Everything in motor has been replaced. All forged. heads are KRE. motor was stroked. It finally went on dyno and rear main from tin Indian leaked. Took it apart and a BOP one pc. was used. Went back on dyno and it leaked. Now he said he has ordered a Best gasket rope seal. it needs to come apart for the third time. Besides having 10K in the build its still leaking oil. I'm not convinced the rope seal is going to do it. crank, block, assembler??