Update - Tune Parts are In - - Now What???

[Zilverado]

Sorry for the lengthy post here, but I need your help. In an attempt to fix a rough running/stalling condition, the following parts have gone in:

- Plugs
- Wires
- Dist. cap
- Rotor
- Air filter
- Air breather
- PCV
- Fuel filter
- and of course - - oil and filter change.

So I start it up to fill the oil filter. Runs great, oil light goes off, and I shut it down to top up the oil. Start it up again, runs great for about 15 secs, then starts to slow, eventually loping badly (rich exhaust). Rev it up and things clear slightly, but very quickly she slows and eventually lopes to a stall. Starting again is difficult and even reving up is rough.

Before anyone suggests it, I'm pretty confident I got the plug wires in the right order - and this condition existed before the work was done.

So does this sound like a carburation issue? I was thinking of maybe removing the top of the carb and cleaning things up a bit (as opposed to a full rebuid - due mainly to time). How can I tell which carb I have - I have attached some photos? Where are the fuel mix adjustments?

Again sorry for all the questions, but just want to get this fixed. Thanks.