FiTech EFI system

Whelp I'll be installing mine soon. Just wondering if anyone has used the timing control and just locked the distributor but not phased the rotor? I'll be running at least 22* at the crank. Maybe more. Total at 36 or under, I'm betting it'll like 34 most. Do I really need to phase the rotor for only 10-12* of timing? I don't believe the MSD rotor will fit my firecore. And I don't wanna try and modify it. So just looking to see if anyone has tried the timing without the rotor phased?