Scott,saw your other thread about clutches in the race section.
I can't answer the 11" vs. 10.5 bellhousing question,but my Centerforce DF 10.5" has been in the car since 08' and takes nothing but constant abuse on the street and strip. No slipping yet. I have to adjust it pretty much after every trip to the track,but it's still going strong.
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‘63 LeMans- ‘69 400 w/ original transaxle. 2.69 gears.
‘55 Catalina
‘62 Mercury Meteor-all original, bought new by my grandfather
71' GTO -original 400/4-speed/3.23 posi
13.95 @ 102.1 on street tires @ 4055lbs.-now my sons ride
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