Could be a choke sticking or not working,she just needs to clear her throat mostly I think.
Cammed cars sometimes don't like to idle or go when cold ,even my 2001 EFI car with a cam is a little stubborn at first when she's cold.
I didn't really see any smoke in the video,she was probably just burning off the condensation etc. as I stated before.
Most old school Chevys with give a puff of smoke when they first start even after just sitting a day or two so I wouldn't worry about it too much.
Get that oil changed asap and that fresh gas in there,she'll likely purr like a kitten.

 

One word - NICE !!!

 

Well messed with it this weekend got it running pretty good. Got some vids but I guess ill need a how-to to get vids on here. Changed the master cylinder, wheel cylinders, fresh oil, etc.. Took it around the block then on a little longer trip about 15 mins. Ran darn good, temps got up to about 200 degrees then hovered around 180 to 190. I'll take it for the first time out in a while.

 

Awesome!