hey guys i just changed the head gasket out on my 90 sc and i got it all back together and it fired up but wouldent idle. i had some vacuum leaks. i fixed those now it wont start at all. then i had some problems with some wiring so i fixed that and it was runing. now it wont run at all and im hearing a clicking sound about every min when the key is tured on, all the way forward. it seams to be coming from the back of the motor but im not sure whats going on so any help would be great.