Where can I get a 'performance' vacuum can for my quadrajet? I'm looking for one that will open much quicker than stock. All the ones I have take 3-5 seconds to release. I drilled the inlet hole out on one of the cans, but it didn't make any difference. I have seen some vacuum cans for sale (I think at carbdoctor.com) - but, they appear to be 'stock' models and probably wouldn't open any faster than the ones I have.