Back in this time period of 1974-75 just as then Governor Ronald Reagan was leaving the state house in California and looking into running for President in 1976, he described his politics as libertarian. His politics were very similar to Barry Goldwater. These were both "get big government out of our wallets and bedrooms" Republicans and Barry Goldwater would probably be called a Libertarian today.
Ron Paul comes the closest to Goldwater-Reagan today. Foreign policy would be where they are different and both Goldwater and Reagan believed in at least some forms of taxation as well. And would be probably be excuse the term, but this is how it is. Shitting bricks if they were alive today and saw what had happened to the GOP. If Barry Goldwater and Ron Reagan were alive today, instead of seeing a party that they built a lot of it on themselves, a party that was around to fight big government.