Hello John, a rhetorical question and then some links to assist you. You've a bit of research/wrenching to do but it'll all settle out
What color smoke?
White (other than at startup) = head gasket/cracked block;
Blue = burning oil - rings, valve guides, valve seals;
Black = rich fuel mixture.
What's under your hood:
If the smoke is black see items 2,3,4 in the center column; you may wish to get a rebuild kit (Carter 8384) and carb cleaner, about $20 total and rebuild. There are plenty of threads on this site about it - easy, take your time, pay attention during disassembly and reassemble accordingly; instructions in the kit are very good. Standard fuel mixture settings for both screws is 2.5 turns out from a gently seated bottom.
How to read spark plugs for engine problem diagnosis:
Factory Serivce Manual for the Carter BBD:
Using a vaccum gauge (connected to manifold vac) for engine diagnosis:
These should provide what you need, to know if it's a tuning issue or mechanical problems.