I see you have used two different tools, fconvert and 3dAnalyzetoAFNI, to convert the data to AFNI's brick format. Rick and I have been discussing this problem. The problem, as it often is, the Analyze format does not specify the spatial position of the data well, so you will need to know it and pass the information yourself to the converting program. A better solution would be to try to get the data originally in NIFTI format that does specify the spatial position better. Of course getting the data into NIFTI will require the same information.

Still if you would like to get the Analyze data into AFNI, you could use to3d (or 3dcopy). The 3dAnalyzetoAFNI program is not recommended (that's what Rich put in the help anyway). The to3d gui will allow you specify the orientation and position information. The two datasets don't share the same orientation, extent or origin, so you would have to enter those. If you don't have that information, you could empirically find it with the Nudge plug-in or the 3dAnatNudge program.