A 3:30 marathon: Is it in me?

I'm finally getting to taper for the Dec. 14 marathon. There is really not a whole lot more I can do to get faster. Now, it's all about the training, what I've done in the previous 16 weeks.
With that said, I've attached my 16-week training log. Each week, I ran a Tuesday tempo run of 6 to 7 miles in a pace ranging from 7:20 to 7:50. I did an 8 to 10 mile run on Wednesdays in paces ranging from 8 to 8:30. And I ran hills on Thursday, about 6 miles. My Saturday long runs of at least 18 miles were in paces ranging from 8:25 to 8:50. I kept a pace of 7:50 min/mile for a 20k in September; and I kept a pace of 7:33 for a half-marathon in November. I'm hoping to run the marathon in 3:35 or better - (8:12 pace) and if everything goes well, maybe a 3:30 (8:00 pace).

Here are my runs, broken down by week, for the last 16 weeks.


Week----Miles-----Avg pace----Saturday long run
8/3------36.24------8:23--------14.18 in 2:02
8/10-----36.60------8:37--------12.84 in 1:54
8/17-----35.40------8:37--------15.42 in 2:18
8/24-----32.08------8:07---------none
8/31-----40.96------8:12--------15.95 in 2:17
9/7------42.13------8:38--------13.31 in 1:59
9/14-----38.41------8:02--------12.40 in 1:37 (20k race)
9/21-----44.33------8:23--------18.25 in 2:37
9/28-----42.45------8:09--------12.02 in 1:39
10/5-----46.44------8:25--------20.25 in 2:53
10/12----41.84------8:07---------none
10/19----50.48------8:20--------20.04 in 2:54
10/26----22.31------7:49--------13.1 in 1:39 (half marathon race)
11/2-----55.70------8:07--------21.52 in 3:02
11/9-----45.07------8:08--------12.00 in 1:35
11/16----55.48------8:06--------22.10 in 3:06

Total miles: 666