Know what your saying ; .620 .620 ,310 duration in the drag motor ( sbc) does not sound radical at idle. average 680hp@7200 on the dyno. 550ft.lbs. @ 5500. Dart 2.08 heads ,long runner Dart intake. oops....wrong site !
Custom ground hydro roller. HP/torque crosses at 5500 ,lines run very close, almost parallel, no "hit" tolerates pedaling towards the beams very well without falling flat. Cam was spec'd for the car/engine package via the builder. You did it correct firstgenaddict.
I talked to Dave Crower extensively when he custom designed a 302 solid roller for me a few years ago.
I gave him everything for the car, weight, rear ratio, trans ratios, tire height, compression ratio, rod length, bore, stroke, he said that the most important set of figures was flow numbers on the heads from .100 to .700 every .100... (if you have stock unported heads the numbers are available) told him we wanted a nice lick and it would be drag strip/street fun driven 1000 miles a year. He had free reign
It also required larger springs, bronze cam gear, cam button.
I hate telling people the lift as it sounds outrageous for a SB (.636 Gross, with the ramps designed to open the valve quick then on close drop it just shy of the seat quickly then gently let it down on the seats so they don't get pounded into the heads.)