Ester oil is what is usually used in retro-fitting like you are doing there. The expansion valve should be okay with 134a if it was working with the old R-12. I would put some dye in too, you can be sure it will be leaking out somewhere over time. Be certain to pull a good vacuum on it for 15-20 minutes at least, you will need a pump for that capable of getting a 25-30 vacuum reading. If it was me, I would try the coversion before replacing the hoses and seals, thats just me. It just wont cool as good as it did with R 12, and the pressures will read a little different, but it should work.
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