So I have this 1969 351 Windsor I rebuilt last year. The car had never been driven until this week..  Fired up plenty, never dripped a drop.  Now that it's actually being driven around it likes to spew small amounts of 
oil on my garage floor.  It is coming from the front of the engine. I can see it coming off of the front of the 
oil pan at the bottom of the pan but I can't seem to locate the source at all.  Could it be the dipstick, timing cover seal, 
oil pan gasket?? all of the above..?  If I start the car and let it idle it doesn't leak..  It's only when it is driven. Looking for ideas on ways to track it down.. Dye with a blacklight

 ??