A company called Professional Products makes some cheap intakes that are supposed to be pretty good, some even claim they make more power than Edelbrock. I was going to get one myself but I got a better deal on a used Dart Coolkan intake. Check out the Crosswind 52025/52026 intake. It's the equivalent to the Edelbrock Air Gap RPM intake. Here's the link:
http://www.professional-products.com...uctSBchevy.php
Also, if you click on the link to my cardomain site under the pic of my Nova you can check out the Dart intake I bought. It is the Dart equivalent to the Air Gap RPM and the Crosswind. These designs of intakes are pretty much the best you can get for overall HP and Torque.