Offsetting the seal does little to nothing to prevent the seal from leaking. I’ve built at least 8 bb Mopars over the past 5 years with no offset on the seal. Zero leaks. It’s all about the alignment of the upper and lower half’s of the seal.
And offsetting the upper and lower half s helps with the alignment of the aluminum retainer itself
I got to play with this when I built my motor last winter
Aligning the seals flush with the block , crankshaft out , and then marking the retainer surface and block with a sharpie when snugging up the retainer and seeing the alignment of the seals with the crankshaft installed and out
Then tried offsetting the seal halves at 12 and 6 , installing the retainer again , and the retainer was in perfect alignment with those sharpie marks
Personally I think a lot of these leaks has to do with the side seals or retainer
