Matt:
Maybe. There is an old saying that Lycoming never made two engines the same. Maybe someone with more experience can answer this with a post.
Depends on:
1. Is it a hollow crank?
2. Does the case have correct bearings that will accept CS operation?
3. Does the case have the hole to add the governor line at the front?
4. Is the accessory case machined for a governor drive adaptor?
If all of the above is yes, then most likely it can be converted.
Lycoming Service Instruction 1435 contains the Lycoming instructions to convert the engine to / from and from / to - fixed pitch / constant speed.
The above SI does not list the -E2B engine but it also does not list my -B2B and I converted it 10 years ago. It has been flying over 9 years and 1,974 hours.
Someone that "knows" looking at the engine should be able to give you a better answer than what I can by this post.