Engine died-idle problem

[w6tractor]

Any suggestions appreciated. I have a 1972 Cheyenne 3/4 ton with an big block 402 and auto. It's been running great. Yesterday it died while driving-no cough or sputter-just died like the key was turned off. Tried to start-turned over but no luck. Thought fuel line was pinched. Straightened-no luck. Fuel was getting to carb. Thought points might be stuck-checked seemed OK. Finally restarted but idle was way high. Got it home but idle is still very high. Any thought on what might have happened? Thanks