Seriously though, the adjuster just comes out to write up a 'standard' estimate based on a repair estimating guide like Denis mentioned. If you know who you want to do the work, take it there first and get a 'real' detailed estimate; then you can hand a copy of it to the estimator when he shows up to help inform him of what it will take to return your car to pre-accident condition. After all, it's not a cookie-cutter Honda or Toyota.
FWIW, a friend of mine who wrecked his Pantera had State Farm, and he thought they were great! The estimator showed up, took a look at the car, and told him to pick a knowledgeable shop to provide a detailed estimate. I think he pointed out some of the idiosyncracies of the Pantera to the estimator too - headlight buckets being different for different years, etc. State Farm paid for the car to be shipped from NorCal to SoCal to a Pantera vendor for a proper repair estimate, and covered the repair costs.