You're not Donald Trump in disguise are you ?

Whatever, you've certainly reached the end of your restricted intellect though - so toddle off back to your own special place and keep your opinions to yourself there.

answering a few questions real quick.

It has new pertronix dizzy with flamethrower coil.

if i remember right i installed the 185lb .495 list springs

The engine sorts itself out after just a few seconds (or less) of coasting.

I have replaced all flex fuel lines and used some 1/4" copper line for the hard line. also have a clear filter right in front of the carb. 

Malsal -I am going to try the valve clearance test after the failure asap. promise. 

I am enquiring about dyno shops in town that are willing to look at the car.

thanks fellas!

I typed out a loooong reply at work earlier on, hit Submit, and the updated firewall laughed at me...
So, here we go again.

Not worried by the smoke or the "death rattle".  Smoke billows like that if you are stationary and have a minor exhaust leak or have been manhandling any part of the exhaust or manifold.  The rattle is probably the timing gear objecting to the misfire.

What dizzy are you running, and does it still have points ?

When the misfire occurs, how long does it take to return to normal running at the stumbly low rpm ?

Does the engine recover its normalness faster if switched off ?

Have you done a compression test while it is misfiring ?

If not, run it till it stumbles, switch off and quickly test the compression - that would eliminate the valve seat dropping out theory.

Have you checked the hard fuel line for impact damage or replaced the flexi lines ?

It almost sounds like fuel starvation, but only when the engine is asking for more over a sustained period than can be supplied.