P1345 help!!!!!!!!

[1loudhoe]

:help: i am ready to pull my hair out on this one, i just had my motor rebuilt by a very reputable performance shop in my area and now i can not get my CMP retard to 0 if i even get close to 0 my truck dies and wont start the closest i could get is +23 and it runs like ****. the motor dose have a comp cam in it (08-300-8) computer controlled cam that is supposed to work just fine in the motor without reprogramming. i have had 3 mechanics and a dealership look at it and no one can give me a strait answer but all have said it might have something to do with the distributor so i changed the cam sensor and the gear on the distributor and it still wont run right, it drives but runs like its out of timing and no matter what i do i cant get it close to 0 on CMP retard. ANYTHING ANYONE can tell me would be great (most likely i have tried it) thank you ahead of time for the tips or tricks.