My recommendation? Along with the things you've already mentioned, I'd bore the block .030" over, mill .030" (straight-cut) off the heads, and install an E cam. This would give you considerably more torque, yet be able to run on 89 octane easily. This also leaves room for mild future mods, should you get the urge, but will still be stout just the way it is.
Take care,
-Chris
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