350 Chevy engine in what? 1990 Corvette? Who built it, did you?
Sounds as though you have plug wires wrong.
Firing order is 1-8-4-3-6-5-7-2
Distributor Ignition System:
Distributor rotates Clockwise. (Rotor)
Find Number 1 tower on distributor cap, go Clockwise with Firing Order.
Distributorless Ignition System:
VIEWING the engine from the Front of the car.
Spark plug wire connections along the back, starting from Left side going to Right side;
2-3-7-4
Spark plug wire connection towards the Front of the engine;
6-1-5-8
(To guess I would say you have 5 and 7 wires switched)
Left side cylinder order is 1-3-5-7, going from front to back.
Drivers side is Left side.
Right side cylinder order is 2-4-6-8, going from front to back.
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Did you do a compression check?
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