Hi Roy,
So I brought the car into the US last Friday. They didn't want the EPA form, since they looked at it and said not necessary due to it's age. The only form they wanted was form CBP Form 7501, which they had a master with all the details gave it to me on a clipboard with a blank to be filled out and signed.
They wanted a bill of sale and a valuation. I only had the bill of sale from when my dad bought it in 1980 so that didn't help. So they had a few databases they looked at and came up with a value of US$50,000. Which I tried to argue them down but without a current bill of sale or appraisal they weren't going to budge. Also the importer has to have status in the US ( Citizen or registered alien with docs ), which I wasn't yet, but my wife is so we had to redo the paperwork so it was in her name. Well that made her happy!
So I paid the duty ( US$1255.00 ) and we were on our way. Whole process took about an hour. The duty was calculated, 3% on 1st 1,000 then 2.5% on the balance.
Good luck,
Mike