Both Holley and FiTech have faceBook Groups:
https://www.facebook.com/groups/SniperEFISupport/
https://www.facebook.com/groups/1138882606178838/

You can search and ask here also.

There is a bit of a learning curve to EFI, but the Sniper and FiTech are pretty easy to install and setup.
If the engine has issues like intake or exhaust leaks it will really mess with the self-learning EFI. Also need a good EFI fuel system that is filtered well. In-tank pump works well and makes install a bit easier because there are less connections to make. Make sure to flush the fuel lines before connecting them.