[jpnovak]

my $0.02. I think you will want a custom grind. The process goes like this.

If you have Extreme do the heads to support airflow for your extra displacement... Then use the flow data to set the lift limit for your cam.

You mention that 7K is your limit (agree with stock bottom end). Then pick your exhaust duration to set this limit. The ramp rates would then be chosen based on lift and duration profiles.

With EFI and ITBs I typically like about 108 deg lobe center. If more narrow your vacuum signals become noisy. Not insurmountable but something that can be avoided up front. Some ECUs are better than others at dealing with speed-density vs alpha-n algorithms and blends of load detection.