Wow this is a really tough decision; I feel for you. I have had to make a similar choice around contacting a father who from a lot of perspectives didn't "deserve" to be contacted (it was a matter of neglect more than abuse for me). Here are some thoughts.
1) The first answer that came to mind was: Only do it for you - not for him. Don't do it out of any sense of obligation or responsibility that you may still carry, or for what you think you're supposed to do for your father; "How can I leave him along, he's still my father," etc. (I don't know if that is relevant or not, but I thought I'd mention it.) Is this something you want? Do you feel it is important for you?
2) I can see that you're already thinking about your motivations enough to recognize that you are looking for a parent, especially with your mom gone - that is understandable, and is not a reason NOT to contact him; but be aware that it's very unlikely you will get that need fulfilled - in other words, prepare to be disappointed.
3) All that said, this actually has the potential to be a healing experience and an experience of growth for you. It's likely the situation will bring up some old, unresolved patterns around your relationship with your father, and how you see yourself. This may give you the chance to "digest" what happened, and "digest" your relationship with your father, in a way that you were not able to do in 6th grade.
4) So, if you think you will be able to emotionally handle the experience, and if you want to, I would see him.
5) I recommend enlisting the help of a therapist to help you work through this process. Our relationships with our parents cut very deep. You're likely to experience a range of contradictory emotions - anger, hatred, love, confusion, desire to be seen by him - its all okay, and it can be helpful to have some kind, objective support. Before you see him, a therapist can also help you understand what you want to get out of this contact, what is realistic, and what action/communication will be most likely to get you what you want. Then, afterwards, you can process the experience with your therapist.
These are just my thoughts - I tend to be supportive of counseling for everyone. Regardless of whether you go that route, I encourage you to stay with your feelings, and be kind to yourself in this process.