I wouldn't see why a polished performer wouldn't fit under the hood I would steer away from the torqer just because unless your racing it the low end torq isn't there...back to the c3by I really couldn't find anything on it other than the c3b is three barrel? and a c4b is 4 barrel? I think this info is wrong. Forgot to ask by why not have the c3b polished? Heres a link to a site that might have info on the intake I just didn't have time to search more or find the vintage intake catalog I have laying around.

http://victorylibrary.com/wwwboard/index3.html