Smithsonian Magazine has a look at the very first SAT test, which was administered in 1926. At first glance, it doesn't seem as difficult as the test is today, however there was a huge time difference which made the original test much more difficult to finish. Today, test-takers are allotted 3 hours and 45 minutes to complete 170 questions; in 1926, they were given 97 minutes for 315 questions. (For a detailed, historical analysis, check out the Smithsonian's notes.)
Shall we take a look and see how you'd do?