Need advice about awesome job opportunity

So I need some advice, moms. For two years from the time my older son was 1 till this past November, I worked part-time from home as a local moms site moderator. It was an awesome job......paid to write blogs, talk on message boards, organize playdates, and occasionally more working stuff like represent site at public events. Anyway, I loved it but it was through our local paper and budget cuts had them cut my position in the marketing department. Anyway, I came across another job that was a lot like mine but on a national site. I would LOVE it! It was list as part time work from home.

Well, I got an email today to start the interview process with a written interview followed up by phone interview next week. Problem is, they now say it is full-time position with 80% of the hours needed to be done during regular business hours. Just checked the site and it is still listed as part-time. So, how can I email them to ask about this without making it seem like I'm not interested if its not part-time?

That's my first question. Second is, ugh! Why does this have to be dangled in front of me as such a great opportunity only to maybe not be so great. My kids are 3 and 8 months. My old job was part time and allowed me to work any time. It was easy to get in the hours during naps, in the evenings, and on weekends. But probably only 2 hours a day were spent during the actual work day. This job is requiring 6 hours a day during 8-5. I just don't see how I'm going to do that.

I guess I will go through the process. Might not even get the job. If I do, then we can test it out for a bit I guess. The money is a little less per hour that what I was making, but still decent. And of course more since it is FT, not PT. Financially we are doing OK now, but we have not really experienced loss of my income yet since I was paid till December. In a few months, we may start worrying. 

I almost wish this had come 2 years from now when both kids would be in school, at least part time. Right now my older son is in 3K just 2 mornings a week. I could put baby in MMO at the same church his brother goes to 3K, but I don't have any childcare in the summer. Could find something I guess. I don't know. I'm happy being a stay at home mom and I loved working PT from home. I hate to through this great opportunity away, but I just don't see how I can get 6 hours in during daytime hours while also being a SAHM full time!