I'm fine with big magnet on the pan and give it a go, but just suggest one thing......examine the new distributor gear fairly frequently for a while just in case that small scoring on your cam gear doesn't turn out to be worse than you think.
Pull it out and check it after break in running, then at 25-50 miles, then after first weekend run hard, etc until you can be assured yourself that the cam gear isn't eating the new distributor gear teeth.
Been there, done that, and it can happen in very short mileage.
Once it looks good and stable wear shadow then you can let it run.
That way you don't ruin the whole short block over something you could have caught in time.
Pull it out and check it after break in running, then at 25-50 miles, then after first weekend run hard, etc until you can be assured yourself that the cam gear isn't eating the new distributor gear teeth.
Been there, done that, and it can happen in very short mileage.
Once it looks good and stable wear shadow then you can let it run.
That way you don't ruin the whole short block over something you could have caught in time.