They sure are pretty when they're new like that. I'm not sure what you mea by "is there any thing else i need or shoudl get?". I don't see anything in your list of mods or parts that would warrant anything more than the stock balancer.
In the pictures, it looks as if the last of the three pictures shows a longer snout than the other two. Leads me to believe that if you order one for a 302 that it will have the required spacing already. Were it me, I'd call them to be sure.
I'll repeat what I said before... reuse your stock one if there's nothing wrong with it. You'll save yourself 200 bones. Unless you're planning to run 8 to 10 thousand RPM, there's not real reason for an SFI approved balancer unless you're into a motor sport that requires one.
Now THAT I agree with. The one you provided a link for does look like a good one and it's one that I would probably purchase if I were in the market for a replacement on my daily driver.