possible clutch problems (need help)

[87 GT MUSTANG]

am recently hearing sounds (squeking or squeling) coming from under neath my 95 mustang gt. I am wondering if at all possible could this be my clutch or maybe even something to do with the transmission. When i engage the clutch pedal it gets louder but when i let off and put it in gear it is fine, when i am ideling in neutral it whines or hisses a little but not as much when engaged to be put in a gear. Could this problem be caused by low transmission fluid or can it be because of my aftermarket B&M shifter. Also i am wondering if anyone can help me out with another problem. whenever my car is running and warm for atleast a half hour or more she just shuts down, i try to start it back up but i get nothing, it turns over but no spark,when i let it cool down a little, it starts back up fine, i replaced the plugs and wires a few months ago and just re-did my cap and rotor, i am wondering if it could be from my coil, it is an msd blaster coil, i am not sure how old it is since it was installed when i purchased the vehicle, any help would be greatly appreciated.