Correct, the change was sometime in 1969. The Eaton clutch style posi (3.36-4.10) comes with the 3/8" holes so if you use a 7/16" ring gear you have to drill the carrier.
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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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