New Start up...350 efi timing help??

I have a 5.7 350 vortec .30 over
comp cams 08-300-8 (grind cs 262h-r12)
duration at .050 206(intake) and 210(exhaust)

I have gotten the motor installed back in the truck.

Long story short... I have removed and re-installed the distributor many many times now and just can't seem to get this thing timed right.

I have been too far advanced and to far retarded.

Just can't seem to set this thing up.. used a tdc stop a few times for tdc.

Also had an old timer come over to help and he helped me set it up just my feeling the cylinder pressure with his thumb. Still didn't work.

Any help appreciated. I'm stuck!