Hi Pete.
A guy I worked with had 5 bypasses a few years ago. It took a while, but he got his Class III back. I suggest contacting AOPA. There will be a bunch of paperwork you will have to send in (I speak from a little bit of experience back when my appendix ruptured) and it would be good to know what all you will need so you can collect it while you go. I had to get a bunch of hospital records, etc. I think my friend had to go something like 6 months after the surgery, then get an EKG etc. to send with the application. A very good contact would be Bruce Chien. He is an AME and pilot and specializes in helping pilots keep flying. He is in Peoria, IL, I think.