I have built a intake! Like all mentioned if this is a Chevy you might buy one, mine was for a early hemi and it took forever and a lot of machining, but a early hemi is a dry intake (at least after '55) and doesn't seal the valley making them MUCH easier than many later motors. Hey if your doing it just to try, have at it you can really hone some skills in building something like this (I call this hot rodding skills) if doing it to save money or for performance buying one is the way to go. Most of all have fun, otherwise it becomes more like work!