The framers were liberal, did they suggest we go back with England or as super-conservative General MacArthur said: "For the frames were the most liberal thinkers of all the ages and the charter they produced out of the liberal revolution of their times has never been and is not now surpassed in liberal thought."
118th Century liberal bore no resemblance to modern liberals. The were as different as oil and water.
There are core beliefs that go with political ideologies, those do not change. The core beliefs are the basis of liberal and conservatism. The means or methods to achieve those core beliefs do change however. For example, role of government was often seen as evil by liberals when the the role of government was to help the elite, royal, noble and moneyed class. When the liberals became the government, however, and government could be used to help the poor and common folk the liberal view of government changed.
This change can almost be traced beginning with Jefferson's election, how he raged against government and its size, and then when Jefferson became the government America bought the Louisiana territory and government and the nation began to grow larger. As a nation we continue becoming more and more liberal.