rear main leak

I was about to install the crank in my Hemi tonight and discovered that I have the wrong main bearings. I have read so many testimonials on the rear main seals that they start to contradict each other. I have a factory rear main seal and a Mancini rear main seal. No instructions with the Mancini parts. After what I went through with rear main leakage on my small block stroker Dart, till I found out what worked for me, and pulling the engine several times, I'm afraid to install the rear main seal in the Hemi! So I am still following this stuff.