Do you currently have rpm left in the powerband? If you aren't crossing the finish line at 400 or more RPM lower than your shiftpoint, I'd keep the 3.08's. Traction might become more of an issue as well.
You are already changing the shortblock, change too many variables and you might waste a lot of time chasing your tail in circles, dialing it back in.
BTW, your current combo is HEAVILY influencing what I'm planning on doing with my '73 ;-)
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'73 T/A (sold). Low budget stock headed 8.3:1 455, 222/242 116lsa .443/.435 cam. FAST Sportsman EFI, 317rwhp/385rwtq on 87 octane. 13.12 @103.2, 1.91 60'.
'67 Firebird [sold], ; 11.27 @ 119.61, 7.167 @ 96.07, with UD 280/280 (108LSA/ 109 ICL)solid cam. [1.537, 7.233 @93.61, 11.46 @ 115.4 w/ old UD 288/296 108 hydraulic cam] Feb '05 HPP, home-ported "16" D-ports, dished pistons (pump gas only), 3.42 gears, 275/60 DR's, 750DP, T2, full exhaust
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