[silicon212]

Changing the belts isn't hard at all, but it does require a routine to be followed. I don't know if the 1980 is set up this way, but later models have the smog pump run off a belt that is driven by the engine fan/water pump pulley. If this is the case with yours, take this belt off first. The older way (and the way your car might be set up) has the smog pump run from the same belt as the alternator. The belt in the front comes off first and goes on last.

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If your car has cruise control, there's a real possibility that the control head siezed. This is the thing under the hood on the driver inner fender that has two cables, a vacuum hose and a wiring harness on it. The two cables are the speedometer - control and control - transmission cables. If this is the case, you will need either a new control head and both cables, or a single trans-speedo cable from a car that doesn't have cruise, and in either case you will likely need to replace the driven gear in the transmission as this is likely stripped. To remove the speedo cable from the speedometer head will require removal of the speedometer head from the instrument cluster. I'd suggest a good manual (a Haynes Chevrolet B-body 1969-1990 manual, #24045, is excellent and about $20 at Autozone/etc).