I need BF tips on getting ready for this ride, which for me will be quite long.

http://www.suburbancyclists.org/quad.htm

My background is I've only been riding RB since August; previously I rode a Hybrid somewhat. But only in August things started getting more serious and I more passionate.

This year, re-started 2 months ago, and I've been riding 4 to 6 times a week solo or group rides varying from 20 to 40ish miles. Including some hard efforts like the other day where I rode with a group one-level too high for me but I kept up at the expense of an average HR of 167bpm for 1:28:00.

Last Saturday I did a metric Century (the group ride ended at 56 but i went for another 7 since I felt great and wanted to reach that mark/goal).

On Sunday, I rode a short hard 14 miles. And on Monday a good 25 mile group ride with insane hill. So I rode about 160 miles that week up until 2 days ago.

Rested yesterday and today I did my core strengthening and arm/shoulder work out that I do since the post shoulder surgery physical therapy from 1.5 year ago.

I'm planning on going for the 76 mile option, with the Intensive Climbing section on my 39 x 27 !! I'm not quite sure it's doable for me!! But I'll try to pace myself haha..

Question - Tomorrow (Thursday) - after 2 days off the bike:
(a) Should I do a solo ride with whatever you recommend / intervals etc?
(b) Should I go on a comfortable pace group ride that plans on doing hill training, hitting 3 good hills in 25 - 30 miles?
(c) Go on a faster group ride for also 30 miles?

And Friday just rest again getting ready for Saturday's event in question?

Thanks in advance!