What do you consider high compression?

With aluminum heads, a cam with the right timing events, and a small quench (.035-.040 or so) you can get 11:1 to run on 93, or maybe even 91 octane. Much above that and it can be a crap shoot. Iron heads will be a compression point or so less.

Don't expect just any cam with (in your words) "mild" timing to work in this situation. Cam timing events are very, very important, and although there are some off the shelf cams that can work just fine, it often takes an experienced person to give a good cam recommendation.

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Dennis
65' STANG (3330 lbs), 393W NA, Toploader 4 Spd, 4:11 TrueTrac, AFR 205's, Vic Jr. Intake, CI Custom SFT, 750dp, 11.0 CR

11.52@121.29mph