I don't think I'd get too concerned about it. All Ford's have a fair amount of blow-by that can look like a lot in certain conditions...
I would say... if it's not losing any coolant and it's not burning much oil... and it starts and runs good... then you probably don't have a problem.
When they really get excessive blow... you're not going to be worried about if you have a problem. You're going to be choking on the stink.