Sounds like Lion-O suffers from TMS syndrome -- too much spit syndrome.
One of my herd (a non-Persian) will drool and drool and drool more if he's in the right mood and I'm willing to sit there scratching him and being drooled on. There's nothing wrong with him. Spencer, one of my Persians, will literally soak himself with drool anytime he goes in a car. It doesn't matter if it's one block or 2 hours -- actually you get the same amount of drool either way.
But he's physically healthy -- mentally, well, he needs to work on the car phobia.
Bottomline, just enjoy it and keep a towel handy!