Holley, and possibly Edelbrock made an aluminum heat shield that fit between the carb and the intake manifold. It was a butt-ugly thing, but it deflected enough heat away from the carb to avoid hot idle problems. It would require an intake manifold change, but the best option for your hotrodded 283 might be a Quadrajet calibrated for a Chey 305 engine. Those carbs have tiny primary barrels for good throttle response, and a secondary air valve to control top speed CFM to only what the engine needs. I ran a single Qjet for a 455 Buick on a 460 cubic inch MOPAR 440 truck pull engine, and got 714 HP on a dyno, corrected for temp, atmospheric pressure, and humidity.
Jerry
