is 11.2:1 compression too much for 91 Octane

Hi I'm wondering if 11.2:1 compression is too much for 91 Octane (highest we have available here) to run properly without engine knock (pinging).

Engine is a stoked 440 (500 CUI) with edelbrock aluminum heads, roller rockers, RPM Intake custom ground hydraulic cam (540 lift), TTI headers and a 3" exhaust. Car has a 727 with 3800 stall and 3.73 gears, engine is currently in a dart.

That's pretty much all the info I have on 'r. I've read somewhere that Aluminum heads will take about a point more compression than steel heads, so just wondering if it would be fine or if it might be borderline running on 91 octane :)