stalling Fleetwood/timing
 

Help! I've got a 1980 Fleetwood hearse with about 88,000 miles that has been stalling recently. Engine is cold, happens when accelerating out of my driveway or from a stop sign very close to the house. Engine doesn't stutter, it just suddenly loses power and stalls. I've replaced the spark plugs, spark plug wires, distributor cap & rotor within the past few months.
Adjusted timing about 3 months ago, not sure if it's correct though - can anyone tell me what the RPM at idle should be for timing? Repair manual tells me to set timing at 1400 RPM but most tachometers won't give a reliable reading if I even get a reading.
Engine is 368 8 cylinder carbureted.
Thanks!