i have the same 750 processor board as you,i did have the 604e board as well but i can`t find it.
if you can replace and solder a 360 BGA to a 255 BGA on a Cyberstorm i will call you LORD OF THE BGA.
you will become MASTER of the BGA and will be ranked higher than me,and if you can do it i will be on my knees.
but im also very skilled in BGA,i install them in almost manual mode just for fun and to keep my skill level up.