The 3.23 gears will not work with the 3.90 carrier. The pinion will install, but after you put the 3.23 ring gear on the 3.90 carrier the ring gear will hit the pinion when you try to install it.
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1967 Firechicken, 499", Edl heads, 262/266@0.050" duration and 0.627"/0.643 lift SR cam, 3.90 gear, 28" tire, 3550#. 10.01@134.3 mph with a 1.45 60'. Still WAY under the rollbar rule.
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