smiley,
ok...a 50 mhz crystal is not a problem
if you have the apollo 1240/25 mhz you can use that crystal
but
from where you got that 3.3 volt module?
is that an original module of an apollo 1260 board?
do you know exactly where solder that?
please note that not any 3.3 volts circuit will work there
the voltage must be exact and precise,
the original module is complex so
if that is not precise you can burn the 060 cpu or make your computer unstable on a horrible way
anyways good luck
but my recomendation is:
sell your apolo board and purchase a blizzard 1260
better card,you can add more memory than the apolo and even you can disconect the card pressing a key on every boot for very well know 060 compatibility reasons
bye, Laser