In reply to Fraser:
70ish meters is plenty for almost everything - as Ally said, the ultra long lines tend to be extensions in the higher grades. Caveat emptor of course... just make sure your belayer ties down the end of the rope!
When I went last year, the guidebook was still widely available (refugio, local tourist information / village "tabac" / or in our case, the landlord of the apartment brought over a copy). Steve Crowe's "bootleg" guide is a good accompaniment for recommending routes (if a little star-crazy). That said, chances are anything you get on 7c-7c+ and around 35m long will be magnificent... and surprisingly on-sightable. My on-sight grade went up by 3 grades at Chulilla (and not just on one occasion... I repeatedly hit the new high). So the grades are either a bit soft or the climbing was just very well suited to my physiology (good at short spells of intense crimping with intermittent rests on jugs) - so don't be afraid to try something harder than normal.... you might surprise yourself.
Anyway, that's a wee bit off-topic.... (or off-topo!). When I went, I found that there were a fair few routes that were not in the guide especially in "mega tufa land" - the Chorreras sector of the north-west facing El Embalse gorge (home of the area classicPim Pam Pons). These, which include a fair few routes in the low 7s, which are in these topos - I hope you find them useful (saving photos on my phone of other folks copies of these really helped make sense of which climb was where):
http://chulillaclimbing.com/crags/