Thanks fellows. That's what I needed to here. Will be ordering this evening. Gonna go with the underdrive. Thinking about ordering the single groove pulleys and eliminating power steering. What do yall think on that?
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73 firebird 455 6x-4 heads 350 turbo 3.73 gears
1/8 7.65 @ 90.95
1/4 11.96 @ 112.60
new best in 1/8th 7.57@91 mph(4-13-12)
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