In reply to EuanM:
Not an awful lot of ascent, descent in the grey corries after the ridge is gained. I think the suggestion of Arrochar Alps is a good one if that's what you're after. Fannichs maybe?
I'm not any sort of runner and don't know about your mont blanc event but I think you're in danger of training the wrong thing: if you are considering lapping munros you'd get your 6000m of ascent packed into a much shorter distance than 90km and also end up with 6000m of steep punishing injury provoking descent too.
I'd be tempted to do long approaches returns up valleys to single hills eg A circuit from glen etive over Aonach mor ridge to Stob Gabhar , out to Loch Tulla back to Etive via west highland way, in and out to Ben Alder from Dalwhinnie, over Beinn y Ghlo from bridge of tilt and back down glen tilt, circuit of Loch Lyon taking in as may tops as you like with option always to return to the track round the loch, run out from Milngavie/ Carbeth/Dumgoyne /Drymen along WHW and up Ben Lomond.
Maybe tempted is the wrong word- the spirit is (hypothetically) willing but the flesh is weak (and over represented)