1975 Mercedes 280

I was thinking of buying a 1975 Mercedes-Benz 280. I spoke to three or four mechanics about it including one who claimed to work almost exclusively on Mercedes-Benz, and each claimed that the car would be very difficult to repair. The mechanic who worked exclusively on Mercedes-Benz told me that he would have difficulty finding parts for any Mercedes-Benz from 1975 unless that Mercedes was one of the "classic" models; then I looked at some Mercedes websites and found what appeared to be a complete selection of parts for 1975 280 for sale. It is easy to obtain parts for the 1975 Mercedes-Benz 280? Are these mechanics right: the 1975 Mercedes-Benz 280 a car that is very difficult to repair? I never had a problem getting my old Mercedes-Benz repaired, but this was one of the "classic" models. Is a

1975 Mercedes-Benz 280 a bad buy for someone who knows little about repairing cars and who's budget is limited?