Can someone please explain to me how to determine whether my '78 308GTB U.S. Version's CAM TIMINGS can be checked to see if they are timed properly ? How do you know if you ae timed correctly for the CAMS ? Secondly, how can I know whether or not my IGNITION TIMING is also correctly timed or set ??? What degree angle setting should I achieve ? What about distributor settings ? Aside from checking the workshop manual, how do I know whether the settings are correct ? My car runs perfectly at low rpms. At 4000 to 4500 and up, it feels like the engine has hit a wall and cannot achieve higher revs.