Mancini rear seal.

Has anyone use the Mancini Racing rear reartainer plate and rear seal on a 383-440? The instructions say to fold the side seals around the retainer and install. So the I guess the folded end of the seal gets squeezed between the retainer and the block? Does this sound right? And the side seals are so narrow just doesn't look like a good design to me. Do you guys use RTV at all on the side seals. I have a drip issue I need to fix and already have attempted twice to fix it with no luck. Any tips you guys have? I am all ears...Thank you