On this car my intake air temps (IAT's) are consistently 90º+F above ambient, whereas my Skylark is closer to 30ºF above ambient, and that one makes sense given since the air passes through the radiator.

One test I haven't done is put the hood scoop plate back in as the low pressure over the hood may simply be pulling exhaust heat upwards. Short of re-installing the scoop plate, a metal deflector around the carb base may cut that down.