Personally it is not the approach I would take. The S&S kit is 10.5:1. Use another cam. If you want to optimize the performance and /or if the heads have some miles on them then you can address that with just a valve job or porting as your budget and requirements require.
An S&S 585 cam is right at home at that compression and with that combination, the right pipe and tune will make in the teens for power and 120 torque with a flat torque curve, still stock throttle body heads and injectors. At this level the items in the way are all the stock items and to step up another 10+ and 5 it would take changing the TB, porting the heads, and larger injectors.