Engine not running right

[protour_chevelle]

Engine is a 350 chev, a high RPM intake(not sure on who makes it), fairly lumpy cam, and other peices to match. Oh also has HEI.

Problem is, when the timing is set between 36-38 degrees it runs like total crap. Stops at 4k rpm and falls over. Before this motor easily went to 6500. Now when we set the timing to 42-46(Yikes). It pulls hard to 5600 then stops pulling. Now theres 2 possibilities for this problem. I'm more interested in the one though.

1. The timing marker on the engine is off(thus showing wrong timing)



2. Something is going wrong engine was causing us to need low to mid 40's of timing. (more interested in this case)

Any help would be great!

-Matt