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Howard
@Dogs
@Dexter @Howard
A fork with the head angle of 68.5° would need a fork that was 128.9° to match the rear being 120mm of presumably vertical travel, if you really want to get into it.
Something longer would give you approx 3mm rise in BB height per 10mm of suspension taking sag into consideration. If it's got a high BB already proceed with caution.
Another thing to bear in mind is that forks tend to be run more progressive and shocks more linear, so you might want something a bit longer with more progression so the feeling of both ends is more similar.
Hope that was nerdy enough for you.