Chris,
All advice given by our members is sound! Timing seems a little light to me. Get a vacuum gauge and set the timing until you get the best vacuum at idle. Then set your mixture and idle settings on the carb to get the best idle at the specified idle speed. 600-650 rpm? Need more info. Was the cam set straight up or with retard or advance? Mild? How mild? Lift and duration specs? When I built a 383 stroker for my '58 Biscayne I started with 8 btdc. Street/strip split duration Crane cam set straight up. Set everything with the vacuum gauge, 180 degree thermostat, Griffin aluminum radiator and Spal electric fan with auto fan thermostat. She would run 185 degrees all day and only crept up to 190-192 degrees on the hottest summer days in stop and go traffic. Be patient and play with the adjustments.
Tim
Last edited by fixit1958; 12/30/2015 5:55 PM.