My 1983 had an aftermarket manifold so the EGR system was missing. To pass the smog test in CT I had to put on a stock manifold (from EBAY) and I then could not get it to pass with any of the Holley Carbs I tried. I eventually had to put on a two barrel and run the timing down to 8 degrees BTDC in order to pass the test, barely. Mind you this was 6 years ago and thankfully 25+ year old cars are exempt in CT so I just put my aftermarket Manifold and double-pumper back on . . . .
EDIT The stock manifold had a big plate under the carb that had the coil mounted on it and it was supposed to control the heat that got to the carb. Mind you mine was an 83 so the 81 might be totally different.