Thunder, unsprung weight does make a difference in handling. And yes, you're right about sucking up extra power. Fostang is correct about the 8" being more suitable for early Stangs. 300 HP and 3000 lb Stangs, especially, street driven, do well with 8" axles, especially in bumpy twisties. Also do well in drag strip runs.
Rev
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'66 Coupe, 306, 300 HP, C-4, 13.97 e.t., 100.3 mph
1/4 mi.
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