LA360 initial timing too high - are there different timing covers?

Cudafever said
Some one could have tried to advance the cam by adding a 4 degree key in the cam but installed it backward. I have done it several times......but i degreed the cam and figured it out. If you pull the cam, pay close attention to the cam key way. does it look half sheared off? If so, is the key making the sprocket move forward or back.
That is some low compression. even for someone like me. that live at 6600 feet.

Thanks Cudafever - I replaced the timing gear, and it looked like a standard key, but I'll dbl check when I go to pull it. The set I removed was a single keyway, and the set I installed was a 3 keyway 0/+4/-4. I did install on 0.