That roller is to big for what you want IMO.Id go with a roller closer to what Cab suggests, around 265 @ .050 and as much lift say 650 or so. You really Don't need to go as big as you would with a flat tappet to get great performance. 512,s with around 12.5 comp and a 265 @.050 650 lift can make around 750 HP or so.

For a car like yours that will see the track about Once a year, the above cam would be ideal IMO Negative on the 276/280.