Popeye,
If we're having to guess, start by putting a fuel pressure gauge on the fuel rail. The pressures should be about 38# at idle and 42-44# at idle with the vacuum hose removed from the fuel pressure regulator. If that proves positive, then a pressure test while driving at wide open throttle is in order. That should be no less than 38#. I think you should be able to buy a fuel pressure tester for about 50 bucks at an auto parts store. If low fuel pressure then you could have a restricted fuel filter or a bad fuel pump. If the fuel pressures are ok, I suggest you test each plug wire for continuity. Approximately 1000 ohms per foot is normal. What you don't want is a plug wire that shows NO continuity. Beyond those tests, you will probably want to leave it to the professionals.
The plug wires on my 95 Bounder 460 lasted 18 years and 120,000 miles, so I suspect we are not victims of excessive under the dog house temperatures.
Richard