Now what are all of the head swap combinations possible and pro/cons of each?

Different tranny, ECU and all manifold combos are of interest as well.

Thanks!!

You can use either a gsr, si, or type r head for b20/vtec. For possible tranny combinations and more b20/vtec information go to http://www.crvtec.com . I chose to go with a b16 head and gsr tranny for my b20/vtec swap.