Check your Firing order over again. If that doesn't work, get #1 cylinder TDC on compression stroke. Then take the cap off and see where the rotor is pointing to what tower on the cap. That's where the firing order needs to start.
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1974 C25 LWB: 454 4bbl Carb / TH400 / 3.73
1992 Camaro RS 305 TBI
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