Asterisk 1.8.3rc3
Trying to get Fax for Asterisk i will be running latest release published: 1.8.3rc3
I see the following:
For Asterisk version(s): 1.8.0 and later (EXCEPT,, and, . You need to download the following:

Can i use this version of 1.8.3 and FFA ?

The published version of Fax For Asterisk 1.3 there should be fine with Asterisk 1.8.3.