hey, first let me tell you about my car: I got an 89 vert, stroked to 347, trickflow heads and stage 1 cam, bbk 75mm TB and EGR, trickflow upper plenum with intake manifold, mac shorty headers and full exhaust, underdrive pullety, 7qt oil pan (moroso), t-56, and some other stuff that I cant remember right now. by changing the cam on the motor, does that change the sound, because it sounds LOUD as hell compared to what it used to sound like. I installed it last week and I finally got it to turn on last night, but there are some problems and I dont know where to begin. First of all i think there is a vacuum leak somewhere and I have no idea where its comming from, the only thing I can think of is this junction of vacuum lines on the passenger side by the firewall, its got 4 vacuum lines merging into a rubber retainer and then 1 vacuum coming out of the top for the EGR. I dont know if it's supposed to look like that because when I took out the stock engine i didnt notice it. another problem i am having is that its backfiring, i am thinking that this is related somehow to the mysterious vacuum leak, or my valaves arent correctly tightened down. one more problem. as i shut off the engine I hear a whistling sound like as if pressure is being released from somewhere. I am thinking that maybe this has something to do with my fuel injectors not sitting properly, maybe an O ring is bad or something, It's loud as hell when the engine turns off. also i have a adjustable fuel pressure regulator with a gauge and the system is not holding pressure when the engine is turned off, is it supposed to?