I think you might have to up the pot a little bit you can buy the HKS from the dealership and i guess the car you are looking for (chapparel 2J) from that ticket is worth 15,000,000 so i would maybe offer upto the trading limit for it 950,000 or a standard car with 0/0/0. I have the ticket what else do you have to offer.
If you do get the ticket you might want to look at getting a second account created so as you can dupe it to yourself and collect all the cars from 1970.