Can anyone estimate how much horsepower torque these parts on a 350 Chevy can give 1-600cfm holley manual choke vacuum secondaries 2-edelbrock torker 2 intake single plane?

Impossible to estimate without detailed information about compression ratio, cam profile, and cylinder head configuration. In general, adding a single plane intake to a stock engine will significantly reduce low-end torque. The Edelbrock Torker II is the worst single plane intake I have ever had the misfortune of using.