i put a newish 350 motor in my K5 , i had to change from the 6 inch dampner to a 8 inch one because the 6 inch one looked crappy and put a bolt on timing tab on the cover, which looks to be in the same position as the old one. when i timed it it would barely run at 6 deg btdc so i advanded it by ear till it smoothed out. my timing light says i am running at 42 degrees advance. i haved pulled the dist out and tried lining it up with number one cyl while at tdc but its not working any suggestions about whats up. i am worried about detonation with it that far advance and not really being able do deterime exactly what the timing is at.