I have just put on some headers and removed a few smog components as per Jim C schematics. Anyay, all seemed well until we took her out for the second test drive (going to the muffler shop). When I got a couple blocks down the road, I could hear a high pitched sqealing/whistling coming from the engine. I pulled over, popped the hood and started looking. It seemed to come from something near the rear side of the carb. All hoses are hooked up correctly--I've checked a million times--but will double-check anything anybody suggests. Oh, also put on a fluid heat riser kit, but that actually wasn't done until after I heard the noise. The noise seemed to go away at first when I accelerated, but when I continued down the road, it started doing it at all RPMS, stopped or driving. Any suggestions?!?!?