ok i put a whole bunch of new mods on, the ford cobra electric conversion kit which transforms a 5.0 into a 93 cobra (cobra computer/24# injectors/70mm mass air) I also just put on the GT-40 upper and lower manifold with a 1 inch phonelic spacer and added the FMS 190 lph fuel pump. Now, my problem is, after approx 5 mins of warmup my engine makes this really REALLY loud high pitch noise, not exactly like a whistle, but really high pitched. I dont know what it is. I have a vacuum guage and it reads pretty normal so i didnt think i had a vacuum leak. BUT, my car also overheats within about 30 mins of idle or less if i drive it. Which leads me to believe that its running lean. I thought maybe because i upgraded the injectors and the fuel pump, but didnt adjust the regulator that maybe that was the cause of the noise and the leanness, due to not enough fuel flow. Havent tried anything yet, but i tried to rule out a vacuum leak because it doesnt make the noise until the car is beginning to get warm. But thats just me, let me know what u guys think or if i should just take it to a shop and be a check writing idiot.