[Bruce Robles]

RMB-Cobra

According to your post you changed the cam and lifters only. I went to the web site you posted and found your cam. Go back to the site and look where it says timing chain onthe chart with your cam. It say's 93099. If you go all the way to the bottom of the page and click where it say's products, go to internal engine parts and find timing sets.

You will see Chains set 93099. It is a full roller chain and sprocket set with 3 different Keyways. These timing sets can be retarded 4 degrees or advance 4 degrees. Your problem is either you used your stock timing chain and sprocket, with will not work, or your mechanic used the right one but couldn't figure out which keyway to use thus the timing is not correct.
If you put your timing set back in or replaced it with a new like one, take it out, buy the right one from Lanuti (93099) call thier tech. line to get the right keyway figured out, and install it.
You can do this yourself with a Chevy easier that with a Ford. Rent a puller for your damper, remove you timing cover and have at it. Make sure your motor is at TDC before you start and be careful not to move the crank while removing the damper. Mark the new Sprockets with white paint where your marks line up so you don't get confused and also so you can see them better since your not removing the engine. It should got like stink when your done!

Good Luck