The F-body has a relatively small drive-shaft tunnel since from the factory, the leaf springs will keep the housing relatively centered compared to the converging 4 link found in an A body. If you take a look at the pinion on GM rear-ends, while they are not perfectly centered in the housing, they are relatively close, especially compared to a Ford 9".
The way your rear-end will be setup, the pinion will be in the same location as it would be with the factory GM rear. This means that the housing will be skewed off-center slightly to allow that placement. This is one of the reasons I decided to do a 12 bolt with Torino housing ends instead of a 9".
That said, the only time you're really going to run into any clearance issues with a 9" (or 12 bolt) is if you're trying to still use a factory style transverse muffler. If your exhaust system currently uses under the floor mufflers which is more typical of aftermarket stuff, you won't have an issue other than the fact that you'll have the housing off-center by a couple issues and one axle tube (and axle) will necessarily be longer than the other.
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-Jason
1969 Pontiac Firebird
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