AFAIK, you should only have to pay tags, smog, and any indicated repairs to the emission system. I seem to recall hearing a year or so ago that the CA "Smog Impact Fee" was illegal somehow, and was refunded to an awful lot of people - and suspended entirely for the rest (do check this!)
Also, have you checked
www.dmv.ca.gov? You might find some resources there - or at
www.arb.ca.gov, the California Air Resources Board..
Provided that the vehicle's engine management system has not been modified, or has been modified with parts that can be proved to have a CARB EO#, you should not have too much trouble. Of course, if ARB EO parts have been used, you'll want to contact those manufacturers and ask for "CARB EO# Underhood Stickers," since that will simplify smog checks for you later.
I'd make sure to get the last smog report from TX - even if it isn't a pretest out here, and I'm sure the numbers won't apply - it will still give you an idea where to look to make repairs.
An oddity - most vehicle manufacturers will either take vehicles that don't meet CA specs and relabel them as "49-States" or "Federal" - and a lot of CA vehicles end up being sold Federally. I'd be only mildly surprised to find out if it actually had a CA sticker under the hood ("This vehicle meets all applicable standard for vehicles for sale in California for the XXXX model year") vice Federal. Stranger things have happend, no?
5-90