I'm going to an 833 OD in my 426 wedge 64 Polara and I'm lookng at getting an extra bh to bore instead of my currnet one. What I need to know is how far can a 4.3" bore be opened before it gets into the pivot mount holes? The od bearing retainer is 5.1" I believe. Can the bh be opened that far or will I have to have the bh bored AND the br turned down? Thanks