Ventura County here also; Simi Valley. Whereabouts in Ventura Co are you?
You'll have a great time at Fall Fling. There will definitly be for sale the items you're looking for. But do your homework and figure out the price ranges on those items, so you know when the good deal pop up.
Better get there around 7am to get in line for the fun field display cars. That way your car will be handy to load parts into and check the stuff you need for it.