can you swap an auto tran for a 5 speed easily?

I hope it's not too hard, cause I'm planning the same type of thing this summer, and I think Im in about the same boat as JM. I have heard about people having driveabilty probs with the auto comp and 5-speed, is this all realated to the harness you were talking about? Is it a big rewire job to switch the harnesses or the little part that you have to do? Also, is it true that the auto comps have better fuel/timing curves? sorry for asking all this in your post, and thanks for any info.