Exhaust stinks!!!

[Telecasterjoey]

So before I put the truck away in storage (we've got 4' of snow on the ground) I found my truck exhaust really stinking. I know what burning oil smells like and its not blowing any smoke but when I stop at a light and the winds behind me the truck fills with this nose burning exhaust smell. I'm pretty good with rebuilding carbs I just rebuilt the q-jet and the truck runs great, tons of power, no hesitation or bog and the secondaries work like they should!

The smell is bad I wish I could e-mail smell lol Its sour and burns your nose, Its not sweet smelling like a 2 stroke, and its not burning oil.
Myself I think its lean but I'm not 100% sure how to fix it! I set the float level to 1/4" and then tuned the air mixture screws with my vacuum gauge its tuned up nicely but it STINKS!

I had a spark plug pic but I cant find it, The plugs are a nice tan colour not too hot looking and definitely not fouled

I guess my big question is: am I running rich or lean? I've had old car guys say both!

truck specs:
86 gmc 1500
1990 gmc 350 block
70's camaro aluminum intake
stock 86' q-jet rebuilt and re sleeved with cliff's performance kit.
hedman longtube headers
dual exhaust no catalytic converters.
Timing at 12*

Thanks a lot!