[Henry Schmidt]

10.5:1 is a ridiculous goal with a short stroke MFI street engine.
Any cam that would create enough mid-range performance would also generate way too much dynamic compression for any reasonable fuel situation.
With a short stroke engine, the piston dome would have to be pronounced, creating two distinct/separate flame fronts and detonation scenarios of infinite challenges.
Think seriously about 9.5:1, In these MFI engines, maximizing compression doesn't yield enough performance to justified the ignition struggles. Low compression and higher ignition will return the snap you get from higher compression numbers.
2.3 66/86 is what I think you're contemplating.
Mod S is one of my favorite cams but they are pretty much done at 6500 RPM.
I've built this engine engine a few times and it has a potential to return around 200 hp. Drop in a little more aggressive cam like a DC 80 [even 10:1] and thing come alive on top [7600rpm] but you lose a lot under 4500.