A833 surface rust on internals

Good evening,

I have acquired several a833's that have been sitting a long time. Several were apart and had surface rust on the internal parts. There is no deep pitting or corrosion. What method do you folks recommend for cleaning this up? Is bead blasting these parts ok, or do you recommend chemical cleaning? I went to Candian Tire the other day only to find out that evaporust is no longer available.
Thanks everyone for your input.