Help needed to check planned ratio change (Shimano)

kiwifraser

Devout Dirtbag
Currently my Colnago Master has the following fitted:

Dura Ace 7700 downtube shifters (8 speed)
Dura Ace 7700 Front Mech
Dura Ace 7700 Rear Short Mech
8 speed Chain
42/53 Chainset
12-25 9 speed Ultegra 6500 cassette (only using 13-25)


In order to use it for the Bealach Na Ba Sportive, I'm going to need better ratios. I have the following parts, so the plan is...

Dura Ace 7700 9 speed shifters (New)
Ritchey WCS Compact 34/50 (Used, but only minimal wear visible on the 34)
9 speed Ultegra 6500 Chain (New)
12-27 9 speed Ultegra 6500 Cassette (new)
Dura Ace Mech as above

Is anyone with experience able to tell me if this will work please?
 
Thank you!

I thought I had it right, but I was worried about the braze on front mech height, and the potential for chain slack using the 34 with a short rear mech.
 
It's pretty much exactly what I ran on my second Majorca trip, except with 7700 sti and an 11/26 sram cassette from my cross bike.
 
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