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Dave, I thought the governor controls the 1-2 shift when the shifter is left in 1st. The adjustable vacuum modulator can alter the shift points. The adjustment screw is inside the vacuum port. Unless the mid 80's diesel TH400's are different than the 70's I have mine set for a 5500 rpm shift...

That confirms the need for a higher stall.

A 383's gonna have more torque than a 350 because of the longer stroke. If your rocker arm ratio is bigger than 1.5 that could put it past the limits of a stock TC Did you put a new or used carb on? If used / not freshly rebuilt, then that is probably the issue. Oh and if your rear brakes are...

The OP stated that he installed an Edelbrock carb.

The stock TC from a 6.2 is gonna kick in before 1,000 with a SBC either get a Holeshot 2000 or a TC from a SBC powered vehicle.

Did you change the torque convertor? probably gonna need at least a 2000 rpm