What Bell Housing for BB Duster?

Go the 10.5",better clearance among other things,just use real good components such as hp clutch and PP,flywheel,in other words dont cheap out on the clutch etc.. 11" is over-rated and the costs and weight/clearence factors in..there is only a 1/4" difference in the clutch disks if any in todays world even tho 10 1/2" versus 11" is 1/2" difference as far as the math goes...I've measured them many times,11" is a waste of time and money,just my opinion,quality components and a well thought out 101/2" set-up will work well..