86 350 Won't run

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Hey thanks for the PCV info.
Fortunately down here in the South we ain’t go to worry about emissions, no smog checks here.

I’ve got a 81 GMC Sierra ½ Ton, with a 1986 350, HEI ignition, Rochester Q-jet M2ME, The other morning when I tried to start it, it was running really rough, once it got warm it seemed to be ok, but the next day it got worse….and so on until it wouldn’t even stay running, during this time, it was smoking a lot when I would accelerate, (Black smoke), When I crank it If I keep pumping it, it will stay running but just barely.
I have replaced all ignition components ( I was planning to do this anyway). But the problem didn’t go away, Its got to be the carb. I am thinking.
Its got good compression on all 8. Since I had to pull to dist. To replace the pick-up coil I have it static timed at 6 deg. Btdc, I can’t keep it running long enough to set the timing.
Any suggestions would be welcome.