Truck was running good has MSD dizzy and coil, starts easy, left it running went to move cars came back and it had stalled out, went to restart will fire up but won't even try run has fuel even tried start ya bustard spray, changed plugs, checked spark, coil etc all has 12v when it fires and u let off key etc can't work this out at all any info would be greatly appreciated cheers

 

I would say your key on power is bad. When the vehicle stalled, that left power to the dizzy and coil. That leaves a few culprits;
1) The key on power circuit may be damaged, wire burned or feed circuit issue.
2) The coil is actually damaged, but works in the start position only.
3) Same for the dizzy.

Here are a couple of steps to take now;
1) If you can, measure the voltage at the coil with the key on, I believe it should be about 9V DC.
2) A second test if you don't have e a meter, turn the key to on. .are sure truck is in park auto, or nuetral brake on standard. Jump the solenoid and see if you have spark since you already know that you have spark while starting.

Just some things to try.

 

You have an MSD distributor, but do you have/are you using an MSD box as well? Seems to be an awful lot of those going bad lately.

 

When you get back in town, take a picture of the knuckle and post it.