Check this link out:
http://67-72chevytrucks.com/vboard/showthread.php?t=396373&page=9I went HOT air for a few years and then installed an intercooler. The install was a breeze, but did MANY measurements to buy the right size I/C and piping kit.
Its pretty cool, no pun, but after a long run. high boost, driving, I will pop the hood and try to grab the piping before the I/C, its almost too hot to grab. Then grab the piping right before it enters the carb, i havent put a thermo on it, but I bet its at least 30-40 deg temp difference.