Hey guys, I have a 1977 chevy with a 350 out of a 1973 chevy in it. I got the motor in and it turns over, but wont fire. It backfires really bad through the exhaust and every once in awhile through the carb. I tried to just get the timing close enough for it to fire but it wont go. I pulled the cap and tried to turn the rotor to the number 1 cylinder, but the rotor will not turn that far. Its pointing straight at the number 2 cylinder. My buddy said he thinks my timing is 180 degrees off. how do I fix this?