YES it is possible

I switched my 62 with a 64 front suspension. The only thing is only about 1/2 the holes will line up the other half are off about 1/4" and one on each side has to be redrilled. I used my 62 steering linkages just had to adjust the toe in a little bit.

It is kinda tricky with the boxed in frame but they left it open on the one side of the frame rails to reach the 7 bolts on each side. I swtiched mine with the motor still in!!! I would advise to take it out if possible it would be alto easier but not impossible to do with it still in. Good luck.
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1962 fleetside: bodydropped,shaved,bagged,custom 64 suspension,clear taillights,custom aluminum parts,rollin on 100 spoke player wire wheels.
http://www.finelinedesignz.ca