revted47,
With all that you have replaced, it must be almost a new truck. My only question is how are you determining there is no spark. Have you had your wife or a friend turn the key on and crank it over while you hold a plug wire that you have taken off a plug 'near' a grounded engine component.
Is this a standard transmission with a stomp starter. The coil can increase resistance as under-hood temperatures go up and result in this problem...you have replaced the coil. I would have to say that this problem isn't ignition related UNLESS your spark test when warm shows no results.
You listed a whole bunch of stuff you replaced but didn't list points. I'm guessing you just forgot to mention them. A increase in dwell means a decrease in point gap, but again, this shouldn't come and go. Have you taken a voltage reading on the primary side of the coil...the wire from key to coil (+) when the truck is hot.
Verifying that there is absolutely no spark at the plug end when the truck is hot will be the first chore! Good luck.
Stuart
