Exhaust manifolds are restrictive and make cam selection even more critical IMO. Too much overlap (whether the result of tight lobe centers or fast ramps) causes excessive reversion that hurts torque.

Faster ramps are not always better, dual pattern cams are not always better, and unless your heads flow a lot at high(er) lift, the benefit of a street roller over a good solid flat tappet can be minimal.

And tell Dwayne I said "Hi" when you call him next time.