88 chevy 2500 350 timing

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i HAVE REBUILT MY MOTOR AND ADDED A 272 CAM. I WENT BY THE BOOK ON ALL OF IT. NOW I HAVE NO POWER. TRANNY IS NOT SHIFTING RIGHT. AND I CAN'T GET IT TIMED. IT IDEALS GREAT. I PUT IT IN GEAR & IT WILL RUN ROUGH & DIE OIL PRESSER GO TO 5. THE TIMING MARK ON THE BALINCER I CAN'T SEE. I TURN IT WERE IT IS TO BE AND IT DIES. EVERY THING IS NEW ON THIS MOTOR. I DON'T UNDER STAND. PLEASE HELP.