Hello,
I am Actionscript 3.0 programmer working in Flash, Flex and Adobe Air. Please check my reviews and feedback at https://www.freelancer.com/u/programmerAS3.html for further reference. All my works are exclusively in AS3 only.
Regarding the project, we can easily use the asset of Actionscript 2. So, I don't think there will be much problem with the work. However, I have taken 5 days as I have not seen the old swf file. I have had an experience of converting AS2 to AS3 and some works are bit difficult as in AS2, the code is embedded in timeline. Otherwise, this should be fairly an easy job. Let me know if you have further queries.
Regards