I am researching replacements for my 071314s motor. What are my options? Is a variable speed motor an option? 
Based on your pump model and info, you can use the B2841 (energy efficient) or B2848 (standard). You can also use the variable motor model ECM16SQU. If this is the original Whisperflo pump, then you may also want to replace the seals and gaskets while you’re there. Those two seal kit options are listed first on this parts diagram that you can view by clicking here.