> 1) Does a positive t indicate a positive correlation and a negative t a negative correlation?
Yes, that is right.
> 2) How can I extract the exact correlation with the cluster found to correlate
> with the seed cluster? My final step was the 3dcalc command in order to
> transfer the z value back to the r value.
Not so sure what exactly you want to achieve here. Correlation at cluster (instead of voxel) level? At group or individual level?
Gang