As you may know, RockWorks does not currently support the NAD27 State Plane coordinate system as an option. If your project data is in NAD27 State Plane coordinates, you can now use the RockWorks Online Conversion tool to transform your data to a different datum. You can upload your data, or copy and paste it into one the online conversion tools found here: https://www.rockware.com/freesoftware/ Once output to the datum of your choice (We would recommend UTM WGS84/NAD83 feet or meters) you can use your data in RockWorks.
This online utility can also convert NAD27 Latitude / Longitude to NAD83/WGS84 Latitude / Longitude and vice versa.
If you have any questions about how to use the Online Conversion tools, this is a good place to come to ask questions or make suggestions.