I just built a 90 model Mrgoodwrench crate motor 350 4 bolt main SBC for my 73 Nova I used flat tops and cam was a Blueracer WG 1051 with 244/252 Duration and 516/525 lift I used a double Timing chain with 3 keyway slots I used keyway 0 I got it running well and starting just right but with a timing light the timing mark is way to the left about 3 inchs from the timing gage on the cover any ideas