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Our car had the small 7 1/4 rear, by no means able to handle what we were about to throw at it. Like I said before, we got lucky with an 8 3/4 spanner along with our engine, and after we install our built-742 case differential, it will be fine. The price of upgrading to an 8 3/4 (especially in an A-Body) is climbing, especially if you want the larger 4 1/2-inch bolt pattern axles, so plan accordingly. While you can compromise with the 8 1/4 under some circumstances, the 8 3/4 remains the rear of choice for most non-Hemi street cars.