Jerry,
Used belt driven WP and
oil pump as we did here. I guess this is a hard one or doesnt really matter as I have hp to burn as my car is lightweight with all alloy running gear. Obviously there is a 65bhp difference between dyno's and the different exhausts would make some difference, but that might only be 10-30bhp.
I guess 15 years ago if you had 600+bhp from a 6litre engine that was good and they used to need high compression to achieve that where this has nice flowing heads etc.