I have a 91 Chevy Silverado and I just put a crate 350 in it a month ago I drove it for 2 days open headers and decided to put mufflers back on it and after I put them on I have no spark at the plugs I have changed ever part in the distributor the pick up the coil,module,rotor button,cap,coil,and the resistor its a hei distributor the only thing I unhooked was the trans lines only thing I could think is the line could of been grounding the motor to frame and letting it fire no their not any advice on what could of went wrong and yes I have ran a wire from battary to coil still no fire