i am trying to diagnose the ticking noise that my 88 5.0 5spd coupe is making. the car runs great and is reliable and a daily driver, but it has a ticking noise. i am pretty sure it is not an exhaust leak. i sometimes hear it on start up and it comes and goes depending on rpm. and varies. sometimes i drive the car and will think it has gone away, then later i will drive it and i will hear it again. the car has gt40 heads, upper/lower edelbrock intake, bigger throttle body, bbk headers, mac cold air intake. in the past it had a real bad tick. we thought it was the lifters and i swapped them out for ones from a 91 5.0 stock with 100K on them. Then when i started the car up it was ticking again so we figured it was the oil pump and it was because the shaft broke. So another thing I was thinking it could be was the lifters or rockers or push rods, also since it had a broken oil pump maybe worn bearings... what do you guys think? what would you check for first? also what oil should i be running in it?