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i know when i instaled my tac it did the same think i do not have an hei but i had the wires switched on the coil
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71 Chevy C/10 lwb 350
5 speed nv3500
3.73 rear end
2.5" Front Drop and 4" in the back
Edelbrock perfomer rpm manifold
Edelbrock 600 cfm carb
Headmen headers
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