By the way, Quatal Canyon between Pine Mountain Club and Ventucopa is pretty awesome too.  I miss SoCal sometimes.

Here's a map/route of a 4-5 day trip, using both above routes. 
http://ridewithgps.com/routes/821697

Dave, I can categorically state that you -can- get through.  It is graded dirt road the whole way.  Whether it's all public right of way is the open question.

I'd look north toward the Los Padres National Forest:
1) Sisar Canyon to Nordhoff Ridge to Rose Valley Lake to 6N31 to 33 (basically a loop North of Ojai) would be an easy first time trip.
2) A bit bigger would be Murrietta Juncal Road up to 6N03 to 5N15/Camuesa and around the Matilja Wilderness.  Could go all the way up to Ventucopa and Pine Mountain Club that way!

A map of the Los Padres forest is all you need.  You will need to figure out how/where to get water.

This is a decent page that covers the southern parts of option (2):  http://www.marcuse.org/harold/pages/077LosPadresMountainBiking.htm

There's a gate, usually closed, on Upper San Antonio Valley Road, where it intersects with 130.   I suspect that the land it crosses is private, but am not sure.  I do know 100% that County Line Road, north of Red Creek Road (south of where you are talking about) is private.

Also be aware you can't cycle in the Orestimba wilderness.  Bikepacking in the rest of the park is allowed, but you'll need a camping permit (which, of course, you also can't get going in via Upper San Antonio Valley, since there's no ranger station up there.)

In short, the roads certainly connect, but you might get dinged for trespassing between San Antonio Valley Road (130) and Red Creek and asked to turn around. 

I think the park master plan does eventually plan for an entrance to the Park here, but when, who knows.

I'd go, and beg forgiveness if you get caught!