NADA books the low retail on a '84 K5 at $3000.
Low Retail Value
This vehicle would be in mechanically functional condition, needing only minor reconditioning. The exterior paint, trim, and interior would show normal wear, needing only minor reconditioning. May also be a deteriorated restoration or a very poor amateur restoration. Most usable "as-is".
Some of the vehicles in this publication could be considered "Daily Drivers" and are not valued as a classic vehicle. When determining a value for a daily driver, it is recommended that the subscriber use the low retail value.
If it's driveable as is, 2K is on the generous side, given the amount of work that you said needs to be done. If it's not driveable - meaning you would have to tow it home - then I think you need to go lower.
Just my two cents. Keep in mind that I don't think I have $3000 in my truck, and I've owned it for 6 years.