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Very correct ProZ---- I assumed vac. line was reconnected.
Ah!... what happens when one assumes.
Affliction often attributed to an ole geezer like myself.:HMMM:

Dwell meter sets the angle of duration of the cam inside your distributor. See specs. on your 283, expressed in degrees.
A valuable tool for setup to your engine would be a dwell/tach/voltmeter. ...

Tim.
Get into your hands a timing light and dwell meter.
When you have set them both according to specs. for your 283, with vacuum off from distributor, you can then adjust carburetor.
As to...