you will be fine mouse
I used a TT bike......, (but not with deep section wheels)
If you are on a road bike I would definitely add clip on tri bars - most of the climbing is long and gradual, so you can sit on your tri bars trying to get out of the wind, rather than being full out of the saddle efforts. There are a several times you need to hoof it out of the saddle, but not that many K in total
On a hill climb TT we did up Tabayescu, (not on the course), I was on my tri bars for 3/4 of it and my speed went up 3 kph when ever I dropped back onto them........
I can add a course profile here when I figuer out hhow if anyone wants it.....