A set of quality 4-tube headers, or a set of used tri-Y's if you can find them. Have an O2 bung welded into the exhaust, when you take the car to a muffler shop. Then get a wideband oxygen sensor, and learn to tune your motor. Rent a chassis dyno for a few hours, and see how the O2 sensor readings relate to actual power.
If you have some money left over, get a torque converter that stalls around 2500 or so. Those changes should knock over a second off of your e.t. at the track.
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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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