Don't stess about this. The more you stress, the more he'll resist (and get negative attention). Keep it positive. I was anxious to get rid of the diapers too, but found it more disgusting and stressful to put him in undies and have to clean up a mess than changing pull-ups. Let him take the lead on training. If he feels he's in control, you might get better results.
My son wouldn't go in the potty for Poops either. I just kept him in Pull-ups. I also used the floor potty for him. He didn't like sitting on the big toilet with the insert - it was too scary. It was gross to clean (especially since I was in the first trimester of another preganancy), but effective. He used the floor potty for a bit for just pee, then, he started going poops in there too. I started giving him a few M&M's for treats everytime he went poop and made a HUGE deal out of it. After he started being consistant with the pooping, I put a stool next to the toilet and took the small one away and continued with the treats - he was still in pull-ups. All the time, we were reading books every night on Potty Training reinforcing it.
Another tactic I used when we were home with no where to go, I'd leave him in his pull-ups after he pooped... until he came to me and asked to be changed. It's gross and cruel, but it also helped him realize he didn't want to be dirty.
My friend's son was 3 1/2 and wearing pull-ups. She sent him to school for 3 full months before he decided he was ready. In her case, he wasn't interested in either function. He just needed to mature a bit physically and see others going on their own.
You could also try play dates with other kids who are potty trained. They love to do things the others are doing.
Good Luck and remember, even though it's frustrating, it is temporary.