One thing I don't like about Comp and others is they don't have people that no what there selling. All there selling is part numbers and what the computer tells them. A few years ago I was looking for a cam for my old 500" RB, its always been a 7200 rpm motor and I wanted to slow it down to 6500. Comps answer was a small 250 duration .550 lift cam, that's it. I called Lunadi and talked with one of the guys who new his [censored] and cam up with a 276/284@.50 and 590/600 lift ground 2 degrees advanced on a 110 cl. I forgot to say this big block has 915 heads that have 2.18/1.84 valves and all the work that goes with them, this is the reason for all the duration.
Peak torque is 620 at 4400 peak horse power is 645 at 6100 and still making 623 at 6500 the limit I will turn it.
It is 12.5 to 1 so e-85

The kids at Comp had no answers for me.