Wait a minute brah. Did you have a box when you were EFI too (I think you might have for the nitrous). As you know, the multiple discharge box can confuse timing lights. Right at 3K is when the multiple sparks change IIRC. Could we be on the right track here?
Also, with the pick-up, IIRC you want it connected whichever way has the timing most retarded. I know you said it could only go one way but it was worth mentioning..............