EGR cooling?

No, NOS carb was on since 1st test as the one I had when I bought it was barely running the motor. You could see light through the throttle shaft. When I got the NOS one put on, the truck ran like new, it idled down to 600 and the mirrors were not even vibrating. Old POS carb wouldnt idle under 900. New rings, valve job with head milling (non issue?) new smog anti-backfire valve, new distributor pot, new fuel pump. Lots of new stuff, just not a new cat (meow!) yet...Hey, I can spend 50 bucks on a Fed cat....Exhaust had a few small leaks in it too right at the muffler that I welded up (wonder if no more dilution of the exhaust at the sniffer made it sense more?) . So for a truck that cant pass smog, this thing runs pretty darn good! New catalytic convertor on order.