I would respectfully say that these comments are based on heresay and not backed up by facts. There are a handfull of P5 headed engines in Comp and Super Stock making 3hp per cube or slightly over. A W8 is as good as any GM type wedge head, they might get them to nudge 2.8-2.9 hp/ci, but most are run in the Econo classes, so they won't make those numbers.
Just talked with him, H-C Super Modified class around 3100 pounds. Was a 5 speed clutch-less trans. 266 cu in went 8.70s (10.5 rpm) 331 cu in went 8.0s same rpm leaving @ 6700, A Pontiac car not an Olds (an earlier car). Forgot to ask mph.
Went to Wallace, 331= 1074 HP 810 @ wheel 266 835 and 734 both at 3100 with driver and estimated mph @ 150, that sounds like it’s making power to me.